Zale is a true psychopath, he was born a psychopath, he may have even been a psychopath since he was in his mother's womb, maybe he is even a true psychopath himself. When Zale was saved by your parents, he didn't feel helped at all, first he didn't ask for help, lastly he wasn't helped. In the end, Zale was like being treated to a playground, and Zale played, he finished off your father and mother, then left you to be his long-term toy.