I. Freedom of Thought: Factual Claim or Normative Ideal?
Like world peace and free chocolate, freedom of thought appears to be an unqualified human good—something to which it would be difficult to object. The Universal Declaration of Human Rights, for example, announces that “[e[veryone has the right to freedom of thought,” and the philosophical literature takes freedom of thought as a virtue whose acceptance spans the diversity of philosophical perspectives.Footnote 1 But the very fact that freedom of thought, especially when expressed in that abstract form, seems so unobjectionable should serve as a warning. If freedom of thought is so self-evidently good, then why, it might be asked, should we worry about it? And if we do worry about it, then what kinds of threats to freedom of thought motivate the worry? A close examination of the ways in which freedom of thought might be threatened reveals that it is not obvious just what freedom of thought is, nor what, if anything, the idea of freedom of thought adds to traditional understandings of personal autonomy or liberty. When we dig beneath the surface of the common homage to freedom of thought, we may discover that freedom of thought may be less of a distinctive virtue than is often assumed, and that at least some part of the common celebration of the virtues of freedom of thought may be misleading. Or so I shall suggest here.
A nineteenth-century German folk song, Die Gedanken Sind Frei, (the thoughts are free), popularized in the United States by Pete Seeger and other folk singers in the 1950s and 1960s, and allegedly often sung by resisters in and out of the concentration camps in the Nazi era, is at the same time both profound and potentially inconsequential. In insisting that one’s thoughts are immune from whatever pressures might be brought to bear on external behavior, the song has come down to us as a testament to the limits of tyranny. But if the sentiments behind the common reception of the song’s meaning are sound, then it remains a mystery why so many political programs, political slogans, human rights documents,Footnote 2 and philosophical arguments believe it necessary to reaffirm and attempt to protect freedom of thought. Deferring for the time being the growing possibility that psychotropic, surgical, electronic, and other technological advances might increase the possibility of literally changing an agent’s thoughts, and putting aside as well the possible technological techniques by which external forces might now or in the future actually know what I am thinking without my exhibiting any external manifestations of my thought, it appears that freedom of thought is simply a characteristic of the human condition. External compulsion in one form or another might force me to say things I do not believe, or might make me do things that are inconsistent with my deeper thoughts, beliefs, desires, and preferences, but the basic lesson of Die Gedanken sind Frei is that thoughts simply are free from external coercion and external knowledge. And if that is so, then there seems little need to worry about freedom of thought, less need to protect it, and perhaps even less need to celebrate it. It just is—a fact that we should relish at the same time that we are happily confident that it cannot be altered. And if that is so, then a principle of freedom of thought, as a normative or prescriptive idea, may perhaps be less consequential than is often assumed.Footnote 3
This is not to claim that our thoughts are entirely or even substantially of our own independent making. We think as we do about what cars to buy, what beer to drink, what clothes to wear, and what restaurants to patronize, among countless other topics, because of the messages we receive from advertising, from other sources of argument and information, and from the actions of those whose behaviors we observe and whom we seek to emulate.Footnote 4 And so too with our thoughts about which political candidates to support, one context among many in which our thoughts are a product of what we see and hear and how we process what we see and hear in light of our antecedent (and also externally influenced) preferences, hopes, fears, and desires. Indeed, even our more abstract thoughts can hardly be conceived of as totally or even substantially distinct from the external influences on the content of those thoughts. Are we utilitarians, Kantians, or Rawlsians? Are we vegetarians, vegans, carnivores, or omnivores? Do we think that Claude Monet was a better painter than Jackson Pollock, or vice versa? And what of our thoughts about pictures of dogs playing poker, or Elvis on velvet? Do we believe that God exists, or not? Do we think that the music performed by the Vienna Philharmonic is preferable to the music performed by Led Zeppelin? And so on ad infinitum.
These examples are designed to illustrate the seemingly self-evident conclusion that our thoughts are persistently and inevitably the product of what we see, hear, read, and experience, and thus are the consequence of our countless interactions with the external world. It could hardly be otherwise, even as we acknowledge that something in us—whatever that might mean—operates on these various external stimuli and influences in a way that makes it possible to talk about our own views, preferences, values, ideas, beliefs, and, of course, thoughts. And thus to talk about our own minds.
At the extreme, we do worry about the phenomenon of external influence, and increasingly so in light of modern technology. We worry about propaganda, which at the extreme we call “brainwashing”; but some of those worries are as much about government action that prohibits the communication of alternative messages at the same time that government is promoting its own. But if we set aside those forms of government messaging that are coupled with government restrictions on nongovernmental or anti-governmental messaging, and if we set aside literal mind control by use of drugs or yet-to-be-developed technological devices,Footnote 5 then the worry about propaganda seems to be a worry about message monopolization. If the state (or some other dominant messager) owns or controls the major sources of information and ideas—the media of mass communication—and if it uses those sources to overshadow all other messages,Footnote 6 then there seems cause for concern in the same way that we are concerned about political candidates with far greater financial resources using those resources to exert a non-equal influence on voter choice, a phenomenon sometimes denigrated with the accusation of “buying” an election.Footnote 7 But of course wealthy and powerful advertisers of consumer products also exert a non-equal (compared to their less wealthy competitors) influence on consumer choice, and even non-wealthy communicators with substantial repositories of social capital—Mother Teresa, Nobel Prize winners, victims of horrific crimes or disasters—may also have outsize influence on what others think and believe. I think that beer is a good accompaniment to watching a sporting event on television, and I think it admirable to offer my financial support to public television, but such thoughts are at least partly a product of the quantity and persuasiveness of the messages I receive, and even the persuasiveness of such messages is a function of the panoply of rhetorical and other techniques employed by those who wish to influence my thoughts. Yet we rarely hear complaints that advertising, subliminal advertising aside, is a threat to freedom of thought or freedom of the mind, even as we often lament the way in which advertising influences consumer choices, often in a socially suboptimal way.Footnote 8 The very idea of freedom of thought, therefore, presupposes a degree of mental independence that I do not wish to challenge here, and which goes to the heart of questions of free will and personal identity.
Still, it is often said that the state, in particular, should not tell us what to believe, and thus what to think. Yet the state, or at least the states with which I am most familiar, urgesFootnote 9 us not to smoke (even when buying and using cigarettes is legal), to exercise frequently, to be careful with what we eat, to wear seatbelts, to refrain from texting while driving, to conserve energy, and to treat our fellow citizens with respect without regard to their race, religion, national origin, gender, or sexual orientation. Now it is true that these examples involve the state telling us what to do, but insofar as there is a belief or thought lurking behind these actions, the state, is also telling us what to think, just as Martin Luther King was telling people what to think when he urged people to judge others based not on “the color of their skin but on the content of their character.”
When we think about such examples, we recognize that the category of propaganda is an amorphous one, and that the label “propaganda” (and “brainwashing” even more so) is theory-laden and pejoratively evaluative, such that a multiplicity of messages attracts the label of “propaganda” only when it is thought by those wielding the label that the message is a bad one or that the sender of the message is in some way to be feared. Those who object to the widespread American ownership and use of guns are prone to describe the messaging of the National Rifle Association as “propaganda,” but would rarely, if ever, say the same of the messages about racial equality coming from the NAACP, or the messages about respect for animals coming from the SPCA. In addition, the category of propaganda seems limited to those messages that come in large quantities, especially when compared to the messages that take the opposite point of view. The advertising of the tobacco industry is, to some, propaganda, but not so for the opposed warnings from the Surgeon General of the United States or the American Medical Association.
Thus, when we worry about propaganda, or its virtual synonym “indoctrination,”Footnote 10 we worry about massive messages for bad ideas coming from disapproved (by the users of the label) communicators that are unlikely to be successfully countered by equivalently massive (or effective) messages for the opposed good ideas. But all of this is to say only that although there are many influential sources of both good ideas and bad ideas, the idea of freedom of thought appears to attempt to identify something beyond the mere fact of external influence on human thoughts. Or, to put it differently, the idea of freedom of thought appears to presuppose some strong sense of free will and personal identity, and a concern about freedom of thought is a concern about the pressures or sanctions that might be brought to bear on the thoughts that this free will and personal identity produce.
Thus, even though our thoughts are at least partly the product of external infuences, freedom of thought appears to surface as a normative prescription principally when the influences on our thinking are unknown to us, or in some other way circumvent our presupposed rational capacities. Back when people worried about subliminal projection—the transmission of messages for such a brief period that the messages were below the threshold of conscious awarenessFootnote 11—the concern was that people were being influenced by messages of which they were unaware.Footnote 12 And although advances in technology and psychology have made it ever easier for people’s thoughts and behaviors to be influenced in countless ways,Footnote 13 a norm or principle of freedom of thought cannot plausibly be marshaled against the full range of techniques of persuasion. However lamentable it may be that our thoughts are increasingly subject to external influence, even to external influences of which we are largely or completely unaware, a principle of freedom of thought, whether embodied in positive law or not, is not realistically the corrective to this ever more-widespread phenomenon. If at some point the technology may be such that Kantians can be made to become utilitarians without their knowledge or consent, or that thoughts can simply be implanted in people’s minds in the same way that kidneys can be implanted or transplanted into their bodies, then there will indeed be cause for concern. Short of that, however, the fact of freedom of thought, as embodied in Meine Gedanken sind Frei, presupposes a degree of human agency and rationality that a norm of freedom of thought can hardly be expected to influence. And to the extent that we do worry about external influence, that worry appears to be a broader one about deprivation of autonomy and agency, and only instrumentally and secondarily about freedom of thought as such.Footnote 14 Perhaps the idea of freedom of thought is thus chiefly a restatement of the idea of autonomy; but that entirely plausible conclusion would not take us very far in explaining why freedom of thought, and not autonomy simpliciter, appears to be the object of so many claims of political theory and so many instantiations in positive law.
II. Autonomy and Freedom of Thought
Closely related to the idea that our thoughts, however much they may be externally influenced, are in the final analysis our own is a line of argument that has long been a part of the philosophical literature on freedom of speech, or, more commonly these days, freedom of expression.Footnote 15 In a highly influential 1972 article,Footnote 16 Thomas Scanlon argued that a distinct principle of freedom of expression, one that would protect acts whose consequences would otherwise justify regulation, can be grounded in the right of autonomous agents as listeners (or readers) to have unfettered access to all of that information and those arguments that the listener might deem relevant in deciding what to do. For the state to interfere with that access, Scanlon argued, would interfere with the ability of people as autonomous agents to make the final decisions about their behavior, including the decision, at times, to violate the law.
Scanlon subsequently retreated from his position in ways that are not relevant here,Footnote 17 but what is relevant is his argument that the right to freedom of expression is not so much a right of the speaker as it is a right of the listener, such that the creation of speakers’ rights is merely instrumental to listeners’ rights to the unfiltered (by the state) universe of ideas, arguments, and information bearing on listeners’ decisions about what to do.Footnote 18
A variant on Scanlon’s position has recently been offered by Seana Shiffrin.Footnote 19 Shiffrin, defending what she describes as a “thinker-based” justification for freedom of speech,Footnote 20 argues that part of being a moral agent consists in having access to the views of others in order best to decide what to do and how to live one’s life. And insofar as Shiffrin’s argument is in part an argument from community—speech is how we relate to, connect to, and deliberate with the other members of our communityFootnote 21—her arguments, albeit powerful, are less relevant to the idea of freedom of thought. But if her arguments are seen in a less communitarian cast, they can be understood as based on the idea that moral agents must be able (and allowed) to think as they please, and that the speech of others is an essential input into developing one’s own thoughts and ideas. Seen in this light, Shiffrin’s claims are indeed freedom-of-thought-based arguments for freedom of speech, for it is the agent’s freedom to think as she pleases that grounds the agent’s right to those arguments and data that would enable that agent to formulate her thoughts, to decide what to think, and, ultimately, to decide what to do.
But now two difficulties arise. First is that, for Shiffrin, freedom of thought is largely a premise and not a conclusion. If freedom of thought is the basis, for Shiffrin as well as for Scanlon and others, of a right to freedom of expression, we still should ask about the basis for that premise. Why is freedom of thought especially valuable, and how, if at all, is it different from general liberty, personal autonomy, and the freedom simply to do as one chooses?Footnote 22 And if we evaluate the question whether freedom of thought as a premise is sound, we find ourselves in the same place we did in the previous section, wondering, futuristic technology aside, what it is, if anything, that distinguishes the idea of freedom of thought from the idea of freedom simpliciter. Put more broadly, an often-asserted but rarely defended dimension of the freedom of thought literature is that there is some important difference between a principle of freedom of thought, on the one hand, and principles of liberty or autonomy, on the other. If freedom of thought is largely synonymous with liberty or autonomy, therefore, there is little to fault in the idea that freedom of expression can facilitate or expand an agent’s informational or experiential base and thus foster that agent’s autonomy. But it is less clear, again, what it is that the idea of freedom of thought adds to a broader concept of autonomy itself.
The second difficulty is that it is not clear how the inputs into thinking that come from propositions offered by others are relevantly different, at least for free speech purposes, from the countless other ways in which we gain insight and information. The fodder for our thoughts—the fodder that we process in order to produce what we tend to call “thoughts” —comes, to be sure, from what others say and write, but it also comes from what we see, what we experience, what we do, and what we are. Without more in the way of explanation and argument, it is hard to understand why what others say is especially—and the “especially” is crucial in attempting to ground a principle or right that is different from a right to liberty or autonomy simpliciter—important for developing our own thoughts as compared to the other components of our experiences, perceptions, and sources of knowledge. And although the lack of distinctiveness of the speech of others in informing our thoughts might not be fatal to thinking that speech is indeed important, it is crucial—not only for Scanlon, for example, but also for the idea of a freedom of speech as a distinct or special right—that the importance of speech is something other than its admittedly important place in the full panoply of human actions, experiences, and perceptions.Footnote 23
In some sense, this last observation is more of an aside when our principal concern is, at least as it is here, with freedom of thought and not with freedom of expression. The problems just noted are problems with using freedom of thought as the grounding for freedom of speech, at least if we consider freedom of speech as a right that generates special protection beyond that which liberty in general might provide. But if we are examining freedom of thought itself, then whether freedom of thought can provide the basis for a right to freedom of speech is largely peripheral. Still, the difficulties with using freedom of thought to ground freedom of speech—principally, the failure of the idea of freedom of thought to explain what is special about the inputs of speech when compared to the universe of inputs that inform and create our thoughts—are suggestive of a deeper difficulty with freedom of thought itself. That difficulty is highlighted by the familiar charge that some action by government or other powerful entity is engaging in “thought control,” or “mind control,” or is setting itself up as the “thought police.”Footnote 24 But the actions that prompt such charges are typically actions that attempt to control what people say or write, or to regulate people’s access to written and printed information, often in the context of claims of censorship by or of primary and secondary schools, colleges and universities, and libraries. Yet those who are taking the actions that prompt charges of thought control ordinarily justify those actions by reference to the behavioral consequences of people having access to certain information and ideas. In other words, the actions that are the subjects of such charges are actions based on what are viewed to be the outputs of, and not the inputs into, thoughts. The stereotypical officers of the so-called thought police rarely if ever claim that they are interested in thoughts as such, but instead insist that they are interested in preventing or controlling conduct. They argue, setting aside for the moment whether those arguments are empirically or philosophically sound, that access to certain arguments or information will cause (probabilistically and not deterministically) people to engage in certain forms of antisocial conduct. They might deny that they want to control thoughts for their own sake, but rather wish to control (or forestall) the intents, desires, and motivations that produce antisocial conduct. And when understood in this way, we can see that those who appear on the surface to be focused on controlling the inputs into people’s thoughts are often—perhaps always—concerned not with the inputs into thought but with the outputs of thought. And it is to that concern that we now turn.
III. Of Harmful Thoughts and Harmful Acts
As we have seen, Scanlon and Shiffrin both focus on the inputs to thought, and thus on the argument that freedom of thought is the freedom of access to the information and ideas by which people formulate their own ideas, thoughts, plans, and decisions. But the argument may prove too much. If the freedom of thought is about the freedom of individuals to think as they will, then that freedom is, on the current state of technological knowledge, a basic fact of the human condition that needs no legal, political, or moral principle to support it. But if, more plausibly, freedom of thought is about unimpeded access to the information and arguments that will help agents to decide what to think, then the principle would seem to encompass the full range of observations, information, and experiences with which we formulate and refine our thoughts. In a word, everything. Perhaps the way in which our experience of the world is filtered through, and illuminated by, the thoughts and speech of others makes those thoughts and that speech highly valuable, but that is not yet to say that it is in some way more or especially valuable, and thus not yet to say that it provides a solid foundation for treating the speech of others as more important than what the speech is about—a differential that is necessary, to repeat, to justify a distinct right or a distinct political principle. And so although a vision of communitarian or deliberative democracy might provide special protection for those communications through which we learn from and connect with our fellow citizens,Footnote 25 the idea of special protection for thoughts as such remains elusive.
Rather than pursuing further the problems with believing that a principle of freedom of thought can tell us much about which inputs to thought should be specially protected, we can turn to the more common concern among those who rely on ideas of freedom of thought with the outputs of thought, and thus with the way in which restrictions on those outputs serve as restrictions on the thoughts themselves. Speech is indeed one of those outputs, and thus we can see why various human rights documentsFootnote 26 are so inclined to conjoin freedom of speech with freedom of thought. That conjunction, however, raises the question whether there is anything about thoughts that justifies protection of the thoughts as thoughts beyond protection of the behaviors, including but not limited to communicative behaviors, that those thoughts might produce.
Let us start with the seemingly obvious proposition that thoughts are different from actions, even the actions that embody what thoughts are thoughts about. Thus, there is a distinction between thinking about going to the gym and going to the gym, just as there is a difference between thinking about a sexual assault and committing one.
Because having a thought differs from engaging in the action that the thought is a thought about, we can direct our attention to the relationship between the thought and the action—between, say, thinking about the desirability of bank robbery and robbing a bank. And one thing we can say about this relationship is that people who think that bank robbery is desirable—who have the thought that bank robbery is desirable—are more likely to rob banks than are people who do not have that thought. Assuming that there are no involuntaryFootnote 27 bank robberies, having the thought that bank robberies are desirable (or necessary, or the like) is a necessary condition for committing a bank robbery.
Although having a positive thought about committing a bank robbery is a necessary condition for actually committing one, it is plainly not a sufficient condition, and that is where the problems arise. Although people who believe (think) that banks ought to be robbed (or that this bank ought to be robbed) are more likely to rob banks than people who do not so believe,Footnote 28 the percentages are low, both for bank robberies and for most other crimes. That is, most people who have positive thoughts about bank robberies do not rob banks. Still, the thought that banks ought to be robbed is in an important sense a harmful thought, in that having that thought is a probabilistic indicator, even if a weak one, of the act that the thought is a thought about.Footnote 29
So thinking that bank robberies are desirable is a harmful thought in the sense that it probabilistically increases the likelihood of harmful acts. The thought itself is not harmful, but the thought raises the probability of a harmful action. If there is a base rate probability for bank robberies for the population at large, then that subset of the population with the thought that bank robberies are desirable is more likely, even if still unlikely, to commit bank robberies than a randomly selected member of the entire population.
One common conception of the idea of freedom of thought holds that possessors of such harmful thoughts ought to be allowed to indulge those thoughts—to remain unpunished for having those thoughts—because they probably will not commit the acts that the harmful thoughts are harmful thoughts about.Footnote 30 Only when the harmful thought ripens into harmful action, it is said, is it appropriate to sanction the possessor of the harmful thought.Footnote 31 But now a difficulty arises, because in many instances it has long been common for the law to punish or restrict people for engaging in preparatory acts, even though those preparatory acts might still not produce the final acts for which the preparatory acts are preparatory. For example, we punish possession of burglar tools as an independent crime, even though some people who are guilty of that crime might not commit a burglary.Footnote 32 So too with punishing people for possessing large amounts of illegal narcotics, not as possessors but as traffickers, on the theory that anyone with such a quantity is likely to sell it unlawfully, even though they have yet to do so.Footnote 33 And so too, more controversially these days, with respect to some dimensions of criminalizing conspiracy and with criminalizing various acts that are criminalized as preparatory to threats on the security of the nation.Footnote 34 In all such cases, the justification for prohibition comes from the way in which the act that someone has actually committed increases the probability that they will commit some further harmful act, even as there remains the possibility that those who engage in the preparatory acts might still not engage in—might decide not to engage in—the ultimate harmful acts.Footnote 35
Now let us conduct a thought experiment. Assume that engaging in some preparatory action A increases the likelihood of some harm H with a probability of p. And thus we can say that the expected harm (EH) of A is the product of the likelihood of the harm—p—and the magnitude of the harm H. And now assume that having some thought T increases the likelihood of some harm (H’) with a probability of p’. Thus, the expected harm (EH’) of the thought is the product of H’ and p’.
The question, then, is whether we can justify treating T differently from A when EH’ is equal to or greater than EH—whether we can justify treating a thought differently from an action when the expected harm from the thought is equal to or greater than the expected harm of the action. Should a putative principle of freedom of thought immunize harm-producing thoughts from restriction under circumstances in which harm-producing actions are not so immunized, and in which the expected consequences of some harm-producing thoughts are equal to or greater than the expected consequences of some harm-producing actions?Footnote 36
When the question is put in this form, it is not obvious that the answer is no, generations of paeans to freedom of thought notwithstanding. Putting aside again the possibility that the state might literally be able to control an individual’s thoughts, the idea of freedom of thought is typically deployed against restrictions of acts and not of thoughts. But what is it about some acts but not others that inspires concerns about freedom of thought? Why is it that preparatory acts are commonly sanctioned but that sanctions for having preparatory thoughts are so often resisted. One possibility, as just discussed, is that restricting a host of preparatory acts, and not just preparatory thoughts, fails to respect the thoughts—the autonomy—of the agent who might not commit the ultimate act. When we punish the possessor of burglar tools or large quantities of drugs that it might be legal to possess but not to sell, we deprive agents of the ability to change their minds and thus to “control” their thoughts.Footnote 37 But if this concern is sound, then it is a concern about preparatory acts as much as it is about preparatory thoughts, and is thus not distinctively about thoughts at all. Perhaps the law, whether criminal law or tort law or some other form of regulatory law, should not punish the creation of risk at all. But if we try to control risk-creation even when the risks are not realized, or even before the risks are realized (think about the laws against speeding, or laws restricting the possession of explosives or fully automatic weapons), then, again, it is not apparent why the risks created by the existence of harmful thoughts should be treated differently from the risks created by the existence of a wide range of harmful acts in general.
Thoughts have consequences. And thus the problem for an account of freedom of thought lies in explaining why consequential thought should be treated differently from consequential action when the likelihood and severity of the two are the same. As Gabe Mendlow puts it, writing in the context of the limits of the criminal law and less about the idea of freedom of thought as a right, “certain thoughts are every bit as dangerous, wrongful, and provable as actions we readily criminalize.”Footnote 38 It is true that people can change their minds, but it is also true that people can refrain from committing the further acts that preparatory acts are preparatory to. Perhaps both our law and our political and moral theory should resist punishing for anything except realized harmful acts.Footnote 39 That is a plausible conclusion, supported by plausible arguments. But there is no reason to believe that an independent principle of freedom of thought adds anything to these arguments, nor is there reason to believe that an independent principle of freedom of thought adds anything to the more general, and at the very least plausible, arguments for liberty in general.
IV. Is It Just About Freedom (or Liberty) in General?
Many of the distinctive liberties enshrined in human rights documents and protected by statutes and constitutions add a layer of heightened protection that augment that offered to individuals by liberty in general. Freedom of speech is a good example. A general principle of liberty, perhaps one modeled after the conclusions in Chapter One of John Stuart Mill’s On Liberty, would protect the individual against state efforts to regulate conduct that does not cause harms to anyone other than the agents themselves. But a robust principle of freedom of speech, of the kind seen in most industrialized democracies in the twenty-first century, protects some communicative acts, not because they are harmless, but despite the harm they may cause. Chapter Two of On Liberty is best read not as an instantiation of Chapter One, but as a separate argument for the protection of activities not protected by the conclusions in Chapter One.Footnote 40 This is most obvious in American law, which is extreme, even by the standards of other industrialized liberal democracies, in its protection of harmful libel,Footnote 41 harmful slander, harmful intentional infliction of emotional distress,Footnote 42 and harmful incitement to racial hatred and violence.Footnote 43 But similar principles prevail elsewhere, even if in less extreme form. And the lesson of this is that a principle of freedom of speech does not just duplicate or instantiate a principle of general liberty, but adds something to it, something that liberty simpliciter does not provide.
So too with many versions of principles of freedom of religious belief. Insofar as such principles are interesting and important only when they protect the religious practices that flow from religious beliefs, those principles once again add an additional layer of protection beyond what a principle of liberty standing alone provides. A principle of liberty might not protect the freedom to engage in harmful discrimination, for example, but this is precisely the issue at the heart of many contemporary controversies about religious freedom.Footnote 44
Against this background, we can understand a robust principle of freedom of thought, especially one formulated as parallel to (or closely conjoined with) the freedoms of speech and religion, as similarly providing an additional layer of protection beyond the protections that might be provided by some putative background principle of freedom, or liberty, or of autonomy. Conceptually, therefore, a principle of freedom of thought would need to be something more than simply a component of autonomy. If it were that, and only that, then freedom of thought as a component of autonomy could not be the foundation of a distinct principle of freedom of thought, which is what is presupposed by most references to freedom of thought. On closer analysis, however, it is not at all apparent what such a principle would do. And if there are things that such a principle would do, it is also not apparent whether it would be good for it to do so. Autonomy itself may not be a self-evident good,Footnote 45 but even if it is, freedom of thought may not add very much, if anything, to the basic idea of autonomy itself.
Perhaps more importantly, most versions of a background or baseline principle of general liberty protect a wide range of actions against state control. A robust principle of freedom of thought would, similarly, provide a degree of protection not otherwise provided by a principle protecting, even if only presumptively or defeasibly, the freedom of action. Explaining what that principle would do, and whether it is good that it should do it, remains the unfulfilled challenge for defenders of an independent principle of freedom of thought.