I'm not so sure he has a right to incite violence in this way especially when it's aimed at another country and we happen to be at war in the vicinity.
This man is a nutcase, he has a very tiny group supporting his extremist pov and he is all over the news right now, why allow him to take his hatred just another step further?
We have a KKK march in my hometown from time to time and it takes extra police, people to control their urge to slug these baiters and for everyone else to swallow it and call it peaceful protest and KKK rights just because they aren't hanging someone from the highest tree.
There has to be a line drawn somewhere. Would you all allow the bible to be burned in protest without a fight?
There is a line. But burning books, any books, no matter how distasteful doesn't come anywhere near the standard required to remove speech from First Amendment protection. Neither does a peaceful rally even if there are calls for violence without more. I've posted it so many times I should have it bookmarked

but your line falls where the violent behavior is both likely AND imminent. See
Brandenburg v. Ohio.
Neither the Florida freaks nor your average KKK rally meet that definition. Nor do groups like WBC or talking heads on tv. BUT they can be punished if they break other laws in the process of speaking. Which is why you get trespassing or drunk and disorderly or vandalism arrests at rallies. It's not the speech being punished, it's the behavior that's against other laws. Speech doesn't make one immune from the consequences of other illegal behavior.