Comment by Hamuko

>So it’s fine to call for violence, as long as the violence in question would be legal if it were acted upon?

No. It's fine to call for violence as long as your call is not designed to provoke and cause imminent lawless action. Brandenburg advocated for "revengeance" against the government if their demands were not met, and that was protected speech. Hess v. Indiana also affirms that advocating for lawless action is protected speech.