People who are brought up to be tolerant and egalitarian stay that way, for the most part, too.

You simply cannot impose speech restrictions in a free society without compromising the very principles it's founded on. Banishing bad ideas or speech only gives the bearers of such filth a kind of underground legitimacy.... in effect, by making them 'too dangerous', you're granting them power. People begin to wonder why the larger society is so afraid. It puts that society in the difficult position of having to explain why it permits some speech and not others. And where does it stop once you begin? Shutting down free speech is a slippery slope that can go both ways.