Fundamentals

Liberalism and Freedom of Expression: Why It Matters and Where Its Limits Lie

By Daniel Sardá · Published on August 31, 2026

9 min read1,831 words

Freedom of expression protects autonomy, pluralism, and scrutiny of power, but it is neither an absolute right nor immunity from every consequence.

Freedom of expression becomes difficult to defend precisely when it matters most: when someone voices an offensive idea, an uncomfortable criticism, or an opinion the majority considers wrong. If it protected only accepted speech, it would amount to little more than permission to agree.

For liberalism, this freedom serves at least three purposes. It protects each person's ability to form and communicate their convictions, prevents those in power from arbitrarily deciding what may be said, and allows a pluralistic society to scrutinize both its beliefs and its rulers. None of these purposes makes expression a right without limits. They do, however, require any attempt to restrict it to be justified with particular care.

This combination—strong protection, precise limits, and responsibility—helps avoid two opposing errors: treating every form of expression as untouchable or calling every criticism, private rule, or legal consequence censorship.

An individual freedom and a limit on power

Freedom of expression is the right to communicate ideas, opinions, and information without arbitrary interference. It also has a less visible dimension: the freedom to seek and receive information. This is how it appears in Article 19 of the Universal Declaration of Human Rights and, in more detailed legal language, in Article 19 of the International Covenant on Civil and Political Rights.

In the tradition of classical liberalism, expression is not a favor granted by the authorities. It is a sphere of freedom that constrains the exercise of power. The state may have legitimate grounds for regulating certain expressive conduct, but it should not be able to punish an opinion merely because it is unpopular, irritating, or critical of the government.

This matters because of a basic asymmetry. An individual can respond, argue, or leave a conversation. Public authorities, by contrast, command laws, sanctions, police, and courts. When they intervene, the potential cost to the speaker is much greater. That is why state coercion requires legal safeguards and more demanding justification than another citizen's disapproval.

Key idea: Freedom of expression does not guarantee that an idea is correct or worthwhile; it protects the ability to hold and voice it without arbitrary suppression by those in power.

Autonomy, tolerance, and equality before the law

Speaking and listening are both part of exercising autonomy. People do not form their convictions in isolation: they compare arguments, encounter the experiences of others, reconsider beliefs, and decide what to defend. Preventing someone from communicating an idea does more than block a message; it diminishes that person's ability to appear before others as someone capable of independent judgment.

Autonomy does not mean living without obligations or disregarding the rights of others. It means that individual conscience deserves a protected sphere free from arbitrary imposition. A liberal society can demand accountability for concrete harms while rejecting the idea that an authority should determine political, moral, or religious orthodoxy.

Liberal tolerance completes this principle. Tolerating an opinion does not mean approving of it or remaining silent. It means living with genuine disagreement without turning every act of disapproval into a prohibition. A person may regard an opinion as false or objectionable, refute it forcefully, and still defend its author's right not to be persecuted for expressing it peacefully.

There is also a requirement of equality before the law. If rules governing expression change depending on who is speaking or which position they defend, those rules cease to operate as general limits and become instruments of favoritism. Protection must extend to minorities, dissenters, and critics, not only to those who enjoy social approval or access to government.

Fallibility: why even error should be heard

John Stuart Mill set out one of the most influential liberal arguments in Chapter II of On Liberty. His starting point is fallibility: no individual, majority, or government can reasonably assume that it is never wrong. Silencing an opinion may suppress something true, but that is not the only possible loss.

A rejected idea may contain part of the truth that the dominant view overlooks. Even when it is entirely wrong, confronting it may force us to explain our own beliefs more clearly. Without contrast, a true conviction risks becoming a slogan repeated by rote: the conclusion survives, but the reasons for it are no longer understood.

This argument does not promise that every debate will lead to the truth. Conversations can be shaped by propaganda, bias, unequal resources, or simple bad faith. The claim is comparative: recognizing our fallibility gives us a powerful reason to prefer open discussion over suppression imposed by an authority that may also be mistaken.

Freedom of expression therefore protects the process of learning and correction, not an allegedly infallible “marketplace of ideas.” It requires complementary institutions and habits: education, an independent press, access to public information, the opportunity to reply, and a willingness to reconsider one's own arguments.

Useful distinction: Defending someone's right to express an opinion does not require agreeing with it, amplifying it, or treating it as equally reasonable as the alternatives.

Public criticism as a check on power

Expression also has a political function. It allows people to investigate public decisions, expose abuses, challenge laws, and hold those who govern to account. Without the circulation of information, citizens cannot evaluate the conduct of public authorities or participate knowledgeably in public affairs.

General Comment No. 34 of the UN Human Rights Committee connects this freedom with transparency and accountability. This international legal formulation is distinct from, but compatible with, the liberal philosophical argument: those who exercise coercive power must tolerate especially broad scrutiny.

The principle does not depend on criticism being polite. Satire, investigative journalism, or protest may cause discomfort and still help hold power to account. At the same time, criticizing an authority does not remove general duties concerning, for example, genuine threats, privacy, or reputation. Context and the specific conduct involved matter.

Four distinctions that keep “censorship” from meaning everything

Many disputes become clearer once we separate situations that are often conflated:

• Freedom of opinion and freedom of expression. The Covenant permits no restrictions on the freedom to hold opinions. The communication of ideas and information may be subject to strict limitations under the conditions established by the Covenant itself.
• State censorship and social criticism. A fine, a legal ban, or official persecution employs state coercion. A rebuttal, a peaceful boycott, or disapproval is not the same thing, even when it may be unfair or disproportionate.
• The right to speak and the right to a platform. Protection from arbitrary interference does not automatically grant access to every newspaper, auditorium, or private service. The legal and contractual obligations of each platform depend on the jurisdiction and the case.
• Legal protection and immunity from consequences. The ability to speak does not require others to listen, applaud, employ the speaker, or maintain a relationship. But merely invoking “consequences” does not justify every reprisal, especially when it comes from the state or conceals unlawful discrimination.

These distinctions do not automatically resolve every conflict. They help identify who is acting, what power they hold, which rule they are using, and what conduct is at issue. Without those questions, “censorship” comes to describe everything from a criminal conviction to a heated argument and loses its analytical value.

Limits: neither absolutism nor vague prohibitions

Words can be connected to real harms. Threats, incitement to violence, invasions of privacy, or damage to reputation raise problems that a serious defense of freedom cannot ignore. Acknowledging them, however, does not authorize the prohibition of every offensive, false, or disturbing message.

Article 19(3) of the International Covenant on Civil and Political Rights provides a useful framework. For states parties, a restriction on expression must be provided by law, pursue one of the enumerated aims—such as protecting the rights or reputations of others, national security, public order, public health, or public morals—and be necessary. The Committee's interpretation also requires a proportionality assessment.

In practical terms, this demands more than invoking a respectable aim. The rule must be accessible and sufficiently precise; there must be a genuine connection between the measure and the harm it seeks to prevent; and it should impose no greater burden than necessary. A vague ban on “inconvenient” content, for example, gives too much discretion to those who enforce it.

Proportionality also requires considering alternatives. Correcting an error with accurate information is not the same as responding with imprisonment, just as narrowly addressing a threat is not the same as prohibiting all discussion of a subject. The more severe the intervention—and the closer the expression lies to political debate or public scrutiny—the more rigorous its justification must be.

Caution: The fact that expression causes offense or outrage does not by itself establish a legally restrictable harm. The conduct, context, risk, and proposed response must be examined separately.

Private power and platform moderation

Digital platforms complicate the picture. They are private actors, but some have considerable power to shape public conversation. Their rules can reduce abuse and make participation possible; they can also be opaque, inconsistent, or difficult to appeal.

Equating all private moderation with state censorship obscures important differences in authority and coercion. Ignoring the power of platforms, on the other hand, leaves out a real problem: far-reaching private decisions can affect who speaks, what becomes visible, and how rules are enforced.

A coherent liberal response can call for transparency, understandable rules, appeal procedures, and competition without assuming a universal right to remain on every service. It must also scrutinize the relationship between companies and governments: a formally private decision calls for a different analysis if a public authority orders it or induces it through improper threats.

How to think through a dispute over expression

When confronting a controversial case, begin with concrete questions:

1. Is someone expressing an opinion, or engaging in additional conduct such as making a credible threat? 2. Who is imposing the restriction: the state, an employer, an association, a platform, or other citizens? 3. Which specific right or harm is the restriction intended to protect? 4. Was the rule defined in advance, and is it applied generally? 5. Is the response necessary and proportionate, or are less restrictive measures available? 6. Is there an opportunity to reply, defend oneself, or appeal?

This method does not eliminate disagreement. It does prevent labels from deciding the issue in advance. The liberal position is not that words should never have consequences, but that the burden of justification rests with those who seek to prohibit them—and that vague powers should be viewed with suspicion because they may later be used against any dissenter.

Freedom of expression protects fallible people in pluralistic societies governed by institutions that are themselves fallible. Its value emerges from this imperfect reality: it allows people to dissent, correct errors, and scrutinize power. Defending it seriously means maintaining, at the same time, openness to disagreement, responsibility for concrete harms, and strict limits on arbitrary coercion.