All of the examples you and many others in this thread are giving are already illegal, under currently existing laws, in most, if not all countries. Threatening

All of the examples you and many others in this thread are giving are already illegal, under currently existing laws, in most, if not all countries. Threatening people with violence, encouraging others to commit violence against other people, actually coming over and stalking people. All of those things are crimes already. There is no need to make another law that makes it illegal to do something that is already highly illegal.