Kind of starting a new or additional theory, I wonder if this guy had been victim of sexual abuse or seen some pretty disturbing stuff to go with the divorce and possible neglect.
That someone is born a demon or something like that, that’s just fantasy, probably some holdover from religious myths about the devil or similar stories.
That doesn’t make me a denier of mental illness , just want to say that those accusation don’t do anything but short circuit logical investigation.
O.k. So I searched it, other people already made similar conjecture public in various venues. The guy had sexual issues enough to drive a lot of people crazy. A lot of people don’t like the questions at all.