The US version of 'free speech' doesn't allow incitement to immanent violence, but it certainly allows for advocating violence.

That's typically what "incitement" is taken to mean, particularly in a legal context: the "request, encouragement or direction of one person by another" to undertake some specific course of action, usually criminal in nature.

It's the "immanent" that's important. Advocating violence is protected speech.

https://en.wikipedia.org/wiki/Imminent_lawless_action