Just a few additional remarks on the way in which the equal right to free speech, and democratic deliberation based on this right, improve the quality of “knowledge” and of political decisions. (Continuing where this and this post left off).
Of course, “knowledge” and “truth” not in any absolute or objective sense, but in the sense of the best kind of thinking a given society at a given time can achieve.
freedom to think as you will and to speak as you think are means indispensable to the discovery and spread of political truth. (source)
Just so far as, at any point, the citizens who are to decide an issue are denied acquaintance with information or opinion or doubt or disbelief or criticism which is relevant to that issue, just so far the result must be ill-considered, ill-balanced planning for the general good. It is that mutilation of the thinking process of the community against which the First Amendment to the Constitution is directed. (source)
Justice Oliver Wendell Holmes, in Abrams v. United States (dissenting):
The best test of truth is the power of the thought to get itself accepted in the competition of the market.
The freedom to speak, the equal freedom to speak, and massive use by large numbers of people of this freedom, result in the appearance and confrontation of a large number of points of view and of perspectives on an issue. It means that a proposal or opinion or policy is subjected to intense scrutiny and criticism. If it survives this, it is bound to be of better quality. Unfounded opinions or opinions that are open to sound criticism are not likely to survive this process. Free speech in general, and free speech as it is implemented in democratic decision procedures, initiate such a process. That is why opinions in a free society and political decisions in a democracy have what we could call an epistemological advantage. They are of better quality. At least as long as we contemplate the ideals. Real free societies and real democracies may fall significantly short of this ideal.
Again, epistemological advantage doesn’t equal “truth” and “knowledge”; just the best thinking we can get. Unfortunately, I’m not being very original here. This is obvious when we return to the Ancient Greeks. The Athenians especially believed that democratic deliberation (which for them was the same as free speech) was essential for wise decisions because it sheds the light of diverse opinions and criticism on policy options. Pericles, in his Funeral Oration, as recorded by Thucydides, said:
Instead of looking on discussion as a stumbling-block in the way of action, we think it an indispensable preliminary to any wise action at all.
None of this is limited to highly participatory systems of direct democracy such as the Athenian democracy, or to politics. The process can occur in modern, representative democracies and in any setting, political or non-political, guaranteeing free and equal speech. The scientific community for example heavily relies on peer participation. It’s fair to say that freedom of speech is essential for any collective search for of or advancement towards truth. In fact, the word “collective” is superfluous here, because the process is by definition collective. No one thinks more or less correctly in isolation.
We normally assume that an ideally conducted discussion among many persons is more likely to arrive at the correct conclusion (by a vote if necessary) than the deliberations of any one of them by himself. Why should this be so? In everyday life the exchange of opinion with others checks our partiality and widens our perspective; we are made to see things from their standpoint and the limits of our vision are brought home to us … Discussion is a way of combining information and enlarging the range of arguments. At least in the course of time, the effects of common deliberation seem bound to improve matters. John Rawls
I know, I know: “what about Socrates!”. Well, the Socratic method is a type of discussion with adversaries which is intended to expose the adversaries’ pretensions, prejudices, dogmas and conventional beliefs. In other words, it targets opinions which are accepted as such, without having first passed through a process of examination and criticism. Socrates is a one man democratic agora, launching different criticisms and counter-arguments at an opinion, and shining the light of many perspectives.