[marklgr]

Free speech, American stylen is all or nothing: either you can say absolutely everything, without any reserve, or it is not free speech.

Free speech, European style, is: let's cut the bottom 1% in public places--knowing full well it will necessarily be somewhat arbitrary, debatable and potentially dangerous--if it gives a much, much saner space for everybody else. That's a trade-off, and not an easy one: opponents to it will immediately ask "who decides", "what if they want to shut _you_ up", or they'll invoke slippery-slope style arguments. But, for all these issues, there is some point where the trade-off is a huge win for society, according to proponents. That's always debatable, but I think it is as reasonable a stance as the previous one.

Besides, it's not because a limit is very difficult to set that we should give up defining one. For instance, think about under age sex; who's to say what age is ok, but two weeks before is a serious crime? It is prone to the same kind of induction and slippery slope arguments as free speech, but most people (me included) don't argue about setting some arbitrary limit.