> speech aimed at inciting quick reaction/violence

Speech alone isnt sufficient to be charged with that, which is why it passed supreme Court scrutiny. Similar to criminal conspiracy laws, where you have to pursue tangible actions IRL not just talk about it with a friend.

Credible threats of violence are illegal despite "only" being speech. Also "obscene" material without any other redeeming quality. So there are definitely exceptions in the US.

Also I believe you are wrong about incitement. It is the speech itself that is illegal, you (ie the speaker) don't have to do anything yourself or even really know or otherwise interact with the would be perpetrators.

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