Cruelty: Are we born with it?

Today I heard an interesting idea. The idea was that, unless tamed or given rules, all humans are born evil. But how do we know if this is true? I think that we can all agree that no matter the person, we are all capable of harm. We were known in the stone age to kill each other for food, and are still known to kill animals for food. We hurt things and people around us every day, but why? According to a recent study by Dr. Gerhard Roth, weak development in the lower central lobe can result in crime and bad behavior. But why? Well, the lower central lobe of the brain is responsible for feeling sympathy and empathy, and if some of that part of the brain is missing, many reactions can be bad. For example, if a person watches another person in front of him die, they will feel negative emotions, resulting in sadness and depression. However, if a person with a small lower central lobe watched a person die, they would feel little to no emotion, and sometimes even pleasure. But why does it seem like people who have good intentions, can be so evil? Let's travel back in time to the Aurora, CO shootings in July of 2012. Here you have a man who is attending a college in Colorado after receiving a full-payed scholarship for mathematics. He was recently turned down in another U.S. school, for unknown reasons, until recently. As it turns out, at his first interview with a school, he didn't pass his behavioral test because of... schizophrenia. The man believed he was "Joker" from the Batman movies. The street definition for schizophrenia is "a total loss of reality," which is exactly what happened to this man. He truly believed that he was "Joker," which later caused him to shoot a room full of people in a movie theater. He dyed his hair, practiced his lines, and truly believed that he was "Joker," and that his only purpose was to harm the world. But what caused this brilliant person to think like this? No one knows. It could be because of many different things. But was it because he had weak development in his central lobe? Well, for now, we don't know. So this post doesn't answer the question to begin with, but the moral of the story is: It's important to be nice to everyone, because you have no idea what kind of day that person is having.