..well it's common sense..at least have a little courtesy before you kill someone..sheesh. you play way too much video games.
Courtesy for the person who wanted to rob/rape/kill you in your home? Courtesy for the person that, after you warn them, will probably go on to victimize a house with less protection than you? Do they really deserve that courtesy?
Kids in school get a worse punishment for their wrong doings while in time out.