But there is one argument in favor of free speech—an argument especially popular in contemporary defenses of campus free speech—that strikes me as especially weak. This is a version of the argument that sometimes goes: The best way to combat bad speech is with better speech. The specific species of this argument I object to is one that insists that we shouldn’t censor bad, dangerous, ideas; we should combat them with better arguments. The best way to defeat bad ideas is through intellectual refutation.
There is an empirical premise here I find highly dubious. Namely, the premise that ideas operate as some kind of marketplace tending toward better quality over time. I don’t think that’s true of the economy, let alone ideas. (Something like the opposite is often true in both realms)
But that’s not my major objection. It seems to me that this is the wrong way to think about the value of hearing opposing viewpoints. The only good reason for an undergraduate to go to any lecture, seminar, or debate is if the undergraduate thinks he or she will learn something from the event.
That kind of learning can fall into a couple categories. (1) We might attend a lecture on a topic we know nothing about to replace ignorance with knowledge. This is why we might go to a lecture on late developments in the field of Egyptology, for example. (2) We might attend a lecture given by someone with whom we disagree so that we can take seriously their arguments in order to evaluate our own. This is the classic JS Mill case. A liberal should listen to thoughtful conservative arguments in order to critically assess his or her own views. (3) We might attend a lecture given by someone with whom we disagree so that we can sociologically understand why it is that so many people hold what we take to be bad ideas. This is why we might (might!) be interested in hearing someone from the KKK, for example. Not because we want to critically assess our own opposition to white supremacy, but because it can be sociologically illuminating to understand why some people hold views we take to be so repellent. In some cases (though not in the KKK case), this kind of sociological knowledge might be helpful in indirectly shaping our own views. Trying to understand why people voted for a candidate we abhor might help us think through how "our side" can better respond to these people's genuine grievances, for example.
But it’s silly to attend a lecture just so we can ask aggressive questions or attempt to refute the speaker. If a student thinks from the outset that he has nothing to learn from a given talk, then he shouldn’t go! If he does go, he should be open to learning something new. And if we are convinced that a particular speaker won't help us learn anything new, then it is difficult to see why that speaker should be invited at all.
(I've written about campus speech issues here and here).