I already have some previous knowledge about my research topic. We learned about criminal's minds in psychology class and I have watched many shows dealing with the issue. I know that serial killers, have many mental issues. They are usually quiet, smart, and have few friends. Some things I have seen indicate that their childhoods may have been rocky but not necessarily all of them. Their mental issues are not usually limited to simple depression but they are disorders along the line of bipolar and things of that nature. I would still like to know if their behavior is linked with their past, by looking at different people's childhood and surrounding factors. I would still like to know why they commit crimes. Is it their mental psychosis or are they pure evil?