Little-known fact of criminology: The most dangerous man on earth, from a child's perspective, is MAMA'S BOYFRIEND
Again, the now well-known "boyfriend problem." When a new challenger drives out the old leader of the pride, he kills and eats all the cubs not sprung of his loins. Such is nature. In the real world, families are not interchangeable lego sets. Of course this is not confined to the male of the species. Otherwise the "cruel stepmother" would not be an ancient fixture of folk literature.
Absolutely right, and thanks for the link to nature, too. When violence is involved, you can bet people are acting out of instinct. That rut in the brain is the deepest.