Cupcake, as a daughter of abusive and neglectful parents I can only say that they lack empathy. One of mine is a true narcissist and isn't capable of thinking of children as people. They are no more significant than creatures. The other is mentally ill but like you I feel there is evil there.
Adults abuse adults to feel power over another person. Adults abuse children to feel power over their own life and because they think the child is an extension of themselves rather than a unique individual.
they do it because of how they were raise and because they dont know whats right from wrong if they parents teached them nothing but to do something wrong i feel some people don't realize how abuse harms a person until there in the hospital or about to lose there life it sucks it takes a person ending in the hospital to get people to care or realize there mistakes some people don't think about there actions before they do it they just do it out of stress or madness or issues by someone else that made them trigger to abuse there love one but i wish people would realize there crimes can effect alot in there life and change everything for the one being abuse .