Humans are very interesting creatures and predictably fearful at the same time. What they fear they must explain in order to give themselves some false sense of safety through understanding. This has caused scientists to spend countless time and money on research into the age old argument of nature vs. nurture. Those scientists supporting nature believe that serial killers kill because of some type of brain damage, disorder, injury, or disease. The scientists that support the nurture argument lean more towards the cause of the killing being from physical and mental abuse, and neglect during the serial killer’s childhood. There is even a science that has resorted to mathematics to try to understand the serial killer. They have drawn a parallel between the erratic behavioral patterns of serial killers to that of natural disasters.
They are still researching and they still don’t have the answers. There are serial killers with no type of brain abnormalities and had great childhoods. I personally believe it is like anything else in life, you either are something or you are not. You are a doctor or you are not. You are a lawyer or you are not. You are a police officer or you are not. You are a serial killer or you are not. I have some other theories, but I will keep those to myself for now. In all honesty, they will never know.