It's not that psycopaths are born evil rather than their chemical structure takes their ability to empathise away. Most people that are deemed psycopaths are prone to extreme curiosity. Because of their extreme curiosity some have eventually come to murder people or kill animals. However, not all psycopaths are murderers. So, I guess what I'm trying to say is that these people are not born evil rather they are born with the lack of empathy and a strong will to discover why things are they way the are. In doing so, they do things which "normal" people would not normally be inclined to do e.g., killing people/animals.