My assumption is that fundamentally the picture of the human animal, as developed by Freud, is largely right.
There comes a certain point in life when you have to stop blaming other people for how you feel or the misfortunes in your life. You can't go through life obsessing about what might have been.
People are, well, only human. We know that. The rule of law is borne out in identifying, condemning, and punishing those who violate the standards on which we all agree. This is exactly what we do in America.