True. Still, in my experience, while I've seen kind, loving parents raise kids who messed up, got addicted, etc., I've never known such parents to raise children with no empathy at all. And I'm old, so I've seen a lot. My experience has been that in these cases there's almost always stuff going on behind the scenes that most people aren't seeing.
That said, I have an open mind. Anything is possible and there's no accounting for the effects of genetics, drugs, etc. And possibly, in this case, bad writing. "I'm sorry, Your Honor. My son isn't evil. He's just badly written." 😁