The big thing seems to be “is there reason to believe that the person saying this believes it will cause people to illegally act in accordance”. I’m some lady on the internet, if I say Nazis should be punched I don’t think I’m going to convince anyone to actually do it, instead I think I’m contributing to a cultural milieu of hostility towards fascists. Elon musk has fans, he has a legitimate platform. He has every reason to think someone might shoot the vice president over this, especially since he’s calling to the same group that has already attempted to shoot the other presidential candidate twice in three months, and particularly because that group in question is people who voted for that guy.