

I understand and sympathize with your point, but unfortunately the law will never be that simple.
To use your example, you walking up to me and saying “hand over your money or I’ll kill you” is not justification to respond with lethal force per se. The missing element here is assault - in other words, I have to believe you both are able and intending to do me harm before I can respond with force. If no reasonable person would believe that what you said was actually a threat (like, for instance, if you were a five year old) then I’m still not justified in harming you in self defense.
Suddenly the lines are super blurry and the slopes are super slippery and its absolutely impossible to tell what a threat of violence is.
Yes. They are. And that was your first example, the one meant to be unequivocally black and white.
The problem here is fundamentally an epistemic one. The law is not a thinking, reasoning being. It is merely a system of procedures. The law does not know - it cannot know - the difference between right and wrong. It only knows what the rules are, and those rules may be wrong.
You might think that there is absolutely no reason to advocate for the mass murder of an entire group of people. And under 99.9% of circumstances, I would agree. But if the zombie apocalypse broke out, I might find myself in favor of killing all of the zombies - and legally, there’s no reason that wouldn’t be genocide.
The law doesn’t know whether zombies are people. It doesn’t know whether or not we are. Therefore, there must be some way to have discussions about the law that are above (or outside the scope of) the law. That’s what politics is, fundamentally: the discussion of the law that’s untouchable by the law. Even if we tried to make certain political stances illegal, we wouldn’t succeed, because that is one area in which the law is necessarily blind.
So we can’t curtail the first amendment.
We can’t execute Nazis.
But we could lynch them, as that would be a political act and not a legal one.
I think you may be the only commenter who actually read the post.