I understand your hypotheticals; however, how many stories of plumbers being shot by neighbors do we hear about? And how many stories of landlords reclaiming their homes by breaking into them because they didn’t have a key do we hear about? I cannot recall even one. Ask me how many stories I hear of scum breaking the law.....endless.
We can come up w/ hypotheticals for EVERYTHING and therefore, not do anything about anything because “something” might happen.
All you have is an old guy who thinks someone has commited a crime. He has little evidence to go on. But he doesn't care. He takes out his trusty shotgun and kills both of them.
I suppose that proves they weren't all that dangerous ~ couple of young bucks, taken out by an old guy.
I think he's going to go to jail as a multiple murderer. Unfortunately they will not execute him, but the history of his type is such that you can almost count on him killing someone else in prison.
Regarding “plumber shot”, it appears 335 times on the net. “carpenter shot” appears 1,140.