I think you're confused. Free speech most certainly does include the right to say I'm going to kill you - unless you're the President. It's when I act on it that I have broken the law. Please don't further the liberal BS by saying that words are not protected by the first amendment. While I understand the reasoning behind the whole crowded theater thing, I don't agree with it. Then again, I think we should go back to the days when the village idiot would get pummeled by the village men for yelling "fire" in the theater when there was none.
True enough in one sense. If you make such a threat however, I have legal recourse to, for example, take out a restraining order against you. Further, there are specific charges, such as Menacing, Terroristic Threats, etc., that can follow such a statement. So you will not be free of the consequences of your speech.
All this aside, here is example of a sane, sober response to the our current situation which spells out where we are and a rational response to it: