Re: The Paradox of Tolerance summarizes my opinion:
"If we don’t believe in freedom of expression for people we despise, we don’t believe in it at all."
If you approve of censorship, you need to be pretty confident that the person doing the censoring is doing so in a manner of which you approve. But, I suppose, any number of real-life and would-be dictators are fully in agreement with that sentiment.
I'll concede that behaviour (i.e. doing things) needs to be regulated, but the only test for speech should be where it is either calumny (calculated, lying libel) or uttered with reckless disregard as to whether or not it is true.
As Sir Stanley Unwin pointed out: "The enemy of subversive thought is not suppression, but publication: truth has no need to fear the light of day; fallacies wither under it. The unpopular views of today are the commonplaces of tomorrow, and in any case the wise man wants to hear both sides of every question."