Case in point:
https://www.theguardian.com/us-news/2023/jan/08/texas-vigila...
The guy had a choice:
* Replace a wallet
* Shoot a guy dead
Obviously, we don't usually hear about the people that pick the first option, but there are plenty of takers for the 2nd.
I suspect that man would have eventually ended up dead anyway to someone legitimately fearing for their life.
There's probably also some calculus of "is society better off without this person?" running through the shooter's head.
America has this weird contradiction of being a place where anyone can get rich, be great, etc. But on the other hand, a criminal is irredeemable, can't change, will never get better, will get theirs tomorrow if not today.
Yes, with a bit more depth to the reading, you'd know that the robber had already collected the money and was leaving when he was shot in the back.
And what happens when another do-gooder walks into this taqueria, sees this guy shoot someone, and then grab money off the body? Wouldn't that person be in the clear to shoot the first guy?
What if the 2nd guy is a police officer?
As for the risk that someone else might mistake the shooter for the robber, anyone who has taken a concealed carry class has learned that there are risks to defending yourself. It's a choice you make because you don't think there are better ones.
But fundamentally, I'm objecting to your characterization that this guy was looking to legally kill someone or that it was motivated out of a desire to keep his wallet. The robber was threatening people's lives. The danger was not over. Shooting the robber was a reasonable choice given what the shooter knew at the time.