Why would you assume that? They are a threat and should be dealt with. Shoot first and ask questions later because there's no guarantee that they won't do the same to you.
Because we have cry babies who want to avenge the death of a criminal. "He's still a human being!!" No, when he enters that window/door with a weapon in my house he's fertilizer. Why? Because I could have been killed if he had the drop on me.I've read on stories where these scenarios did happen (the execute part) and, while the person that killed his assailants don't really ever get crazy punishments, they still go to jail for a time. Like, why?