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We will have to disagree on that. I think intolerance is dangerous, not tolerance.
To me the idea that someone (who?) Decided what can be said and what not is dangerous. If the problem of Nazi ideology is that it does not tolerate others, how is not tolerating its proponents doing any good? It actually seems like mimicking their behavior and thus spreading it. Sometimes by fighting the monster we become the monster...

There is one thing about 'hatespeech' you may not have considered: by banning certain views you take away from the public the ability to evaluate all views and arguments. See what I mean? That seems rather patronizing.

who defines hate speech
I just checked the first amendment...didn't see it.
Please enlighten me.