Some Ukrainian soldiers took a video selfie of them killing wounded Russian soldiers who they captured. If a guy with a gun breaks into your house and you and your wife and kids are home and threatens to kill all of you you're allowed to use deadly force in self defense. Obviously. If you seriously wound the burglar-rapist-robber and disarm him and he's lying in the middle of your living room floor you should call the police to take it from there. If however you're so pissed that you go up to the seriously wounded burglar-rapist-robber and put him out of his misery with a kill shot and then call the police I don't think the cops would take you in. The better practice is not to execute the burglar-rapist-robber.