We don't go around killing and raping each other. In fact, the rapists and serial murderers are exceptions, not the rule. Either human nature has changed considerably over the past few thousand years, or society has, or the original ideas were wrong . This is the business of crime, whereas personal crimes like rape, murder, and molestation are usually the result of a bad upbringing. Moreover, it's no accident that crime flourishes in poor areas.
Poverty breeds crime.
The Original Sin crowd likes to paint criminals as evil people, or lunkheads, when in reality they're people who have decided to work outside a system which offers them nothing. So, what you have from the Original Sinners is the idea that people are eternally bad and in need of control, which they then provide through more and more social control. The end result of their logic is the complete negation of human will and freedom. The State is the single largest serial killer around, and has a seemingly unquenchable thirst for blood. The root of human nature is our sociability .