My point is that a disappointing number of people fully believe it would be good and right to shoot a thief dead. They're sane. Radicalized, maybe, but as sane as they come.
The other situations are circumstantial, but if I am being accosted by someone in public, I'm drawing on them. As a pizza delivery driver in my younger years, this happened a lot more than I would have liked. No one got shot because they retreated. If they made a motion towards their waist, back, or lunged, they would have been.
In this case, I have issued a warning that this will end badly if you continue, and any further threatening act will get them shot.
If you're talking about witnessing a robbery, even of my own property, and the thief running away, then no, that is insane.
There are plenty of societal sticks that are not homesteaders with a rifle.