"Do you not accept a line where free speech threatening violence harms other free individuals? "

I don't.

I rather have people saying out loud, that they want to kill me, than saying it it in private and then just doing it ... so I - and others (like police) know whats going on, and can prepare for them.

If you forbid things to be said out loud, they will just boil hiddenly, until they explode.