You're parents sold you to a laboratory when you were young, it wasn't the nicest laboratory and they abused you. You were getting sick of this and you snapped and killed almost everyone in the lab. A few scientists was left and some of the other experiments were dealing with them.

A scientists was badly injured because of you and was cornered. "What? You're doing this now? Don't you love us?" The scientists asks, trying to guilt trip you into sparing him.