Violence is a circle. You do it to someone, they do it to you. The only way to stop that cycle is to kill your target. Now murder's on the table for anyone who thinks a type of person is unacceptable, which is only sensible until it really, really isn't. Operating under the assumption that violence is a reliable deterrent will ultimately get you killed, man. Unless you plan on being the only guy with the nuclear option at your disposal. Good luck with that one.
Peace should be the standard, even when it's hard. Don't get me wrong, there are people I won't shed a tear for when they get hurt. But I would consider the best case scenario to be "a problematic person course corrected before they hurt anyone" and the next best to be "a problematic person learned from their mistakes". That's what accountability looks like imo, and we don't always meet that mark. That's a shame, but not big enough that violence is the only answer we have. We can and should be better than that.