No, there hasn't been anyone in my life that had fucked me (Heh. Inside pun. *koff*) over so badly that I'd felt the urge to kill them. I'm just not a spiteful person. Granted, I've gone through difficult times that were the result of a single person's actions, and some people probably would have gone insane with rage if they were in my shoes, but if I had terminated the source...nothing positive would have come out of it. I wouldn't have felt any better, the pain would have still been there.

Under certain circumstances I probably could kill. Everyone has the power to kill. Even a toddler with a loaded gun.