"Most people are able to overcome the 'natural instincts' to go around trying to have sex with anything that moves, defecate wherever they like, and grab hold of anything that takes their fancy."
We're NOT "overcoming" them. We're merely repressing them. Thing is, it builds up like water behind a dam, and the dam doesn't have very solid foundations. Or perhaps a better analogy, a forest that keeps getting tinder built up. Sooner or later, the dam's going to break down or the forest is going to flash into a blaze. Why do you think we see so much scandal these days? We LIKE to think we're creatures who can control our emotions, but when crisis hits, what do we turn to? Not the brain, the gut, and like I said we do it practically on a reflex, without even thinking so we don't even have time to consider our actions until it's too damn late.