There'd be 10 other men "good and true" to bang our heads together until we saw sense. Besides, we have majority verdicts here; don't you?
I want to move this away from the Chicago killings, because we're debating general principles now. I agree that someone who killed an armed robber in commision of the crime would appear to be a hero - but even he should face some form of inquisition or trial to ensure that it really was an armed robbery and that he wasn't either an accomplice masquerading as an innocent party, or the person who initiated a fire-fight in which everyone else got killed.
TYWD