But thinking that appeasement will get you out of trouble is a gamble, and people who opt for that don't always win.
When I hear people make the, "Just give up your stuff. Nothing you own is worth risking your life over," argument, I agree, but I also think those who make the appeasement argument are taking for granted that their hypothetical robber is a sensible, rational person.
By & large, people who commit armed robbery are not sensible and rational. They usually are impulsive and of below average intelligence. You can't depend on a robber to make good decisions, because if he were sensible & rational, he wouldn't be committing armed robbery in the first place.
Armed robbery is one of the dumbbest crimes to commit. It offers a low return for the legal risks involved. The legal system agrees that money & material possessions are no comparison to someone's life & limb. That's why smart thieves burglarize; they steal stuff when no one is present. Stupid thieves rob, which by definition involves imminently threatening their victim(s).
A decent burglar can steal a ton more than what a robber does, and if he is caught, he'll probably be released on bond in a day. At worst, he faces several months in jail. A robber who is caught faces felony charges. It's worse if he commits his crime using a gun. If he seriously injures his victim, he faces years in prison. If he kills his victim, he faces life in prison or the death penalty.
There-in lies the conundrum for the armed robber. If a robber understands the gravity of the crime he's committing and the severity of legal consequences if he's caught, then there's a good chance he'll be more motivated to leave his victim in a condition where the victim can't identify the robber. If he doesn't understand that (because again, robbers tend to be impulsive & unintelligent), then he might shoot his victim anyway, because bleep it, why not? it adds to his street cred.