If you could kill someone and knew you'd TOTALLY get away with it, would you?

no, because that doesn't happen in the real world and for make-believe worlds where you can kill without consequence i care not.

you would never get away from the demons in your head, at least. it would become either another thought you can't let yourself think -- lest you realize the enormity of the simplicity of the act -- or the first step on the path to more death. you would either fear yourself or be consumed.