Humans have an inherent capacity for cruelty, not only a capacity, but an enjoyment. I'm not just talking about rape, war or serial killers but a more casual hunger for it...

A picture of an ugly or fat innocent person gets it's way to some Twitter or Instagram meme account ? A climax of mockery will ensue.

Why? Because humans are designed to look for reasons to feel better than someone else if their egos aren't strong enough.

People cheat on their partners or sleeps with someone in a relationship all the time. Why? Because humans love the power that comes with making someoene want to surrender their bodies in the most intimate way possible to them, it makes them feel valuable, never mind how unethical doing this things is.

People abuse staff making impossible demands knowing they are impossible because they love the thrill of authority and the fear they inflict on the employee of losing their job.

Bullying and social outcasting is ripe in schools all over the world because the human brain rejoices in establishing hierarchies.

We are designed to be sadistic psychologically and sometimes physically. There's even saudies suggesting that our brain gets rewarded with dopamine when we put someoene down since we develop a capacity for reason

People are just evil by nature. Nobody ever had to take a class on how to lie, cheat, steal, murder. In contrast, we all have to take "ethics" class. The ethics parts is the real brainwashing.