Spencer is a white-supremacist shitbag, yes. His ideology, however, is very different from Hitler's, and he has never publicly advocated violence.

Again, my scenario is not hypothetical. See http://www.wnd.com/2017/02/oppose-terror-youre-a-nazi/

">The context you are referring to has repeatedly born out that American law allows private citizens to say or express anything, no matter how hateful, as long as it's not an incitement to violence nor slanders a specific party.

This is still very ambiguous. There are MANY situations where the above statement is not true."

Show me one.