When it comes to preemptively removing someone from circulation, I sure ain't.

Ditto for where my responsibilities lie. My primary ethical responsibility is to my family first, then to myself. I don't have an equal responsibility to my neighbor.

Thus, shooting some guy and getting locked up, sued, or (worse) losing the gunfight, fails my primary ethical duty.

If you want to sit around and quote the 2A at me, you've come to the wrong place. I deal in realities, not ideology.

Semantic argument. I could just sit around, holding my gun, while I get beat to death with a rock. But most people would agree that standing still while being bludgeoned to death does not count as a viable option.