If AB is going to lower a crane on a movie set. There is a car hanging from the crane. All he has to do is raise it slightly and than drop it. So he goes in the cab and hits the wrong lever and swings the crane and hits/kills someone. Can he say “I’m dumb, I didn’t know what it did”? “Someone should have made the crane stupid proof”.If he doesn’t know basic crane safety, he shouldn’t touch it. If he does, it’s negligent. What’s different about a gun?
I also wonder if a basic investigation was conducted? Like was AB screwing this girl? Did they test him for drugs/alcohol?