Sometimes people are just horrible people. I think its a mix of all sorts of dysfunctional people.
My eldest uncle maybe was one. His cruelty was in its highest form when you were at your weakest. His little brother was just angry. I watched him almost kill his son. My father is a narc. My son is laws father is the product of abuse, an idiot who just thinks that beating the shit out of a child is how you raise them.