[emodendroket]

> You can not. Inciting violence and calls for criminal action is a well establish limit of the First Amendment, but that is not what they are doing from what I gathered in this thread.

Saying "ethnic group XXX should be exterminated" does not meet the standard for incitement. I don't know why the debate has become about US law but I'm even more puzzled about so many people confidently stating, wrongly, that the US bans hate speech. The US has frequently been criticized by Europeans for this exact reason -- in their view, the US stance permitting hate speech is irresponsible.