Where evil lurks: Neurologist discovers 'dark patch' inside the brains of killers and rapists http://www.dailymail.co.uk/sciencet...ide-brains-killers-rapists.html#ixzz2K57yXsDC Dr Roth said no two criminals are alike. He divides them into three groups for the purposes of his hunt for evil. The first he classifies as 'psychologically healthy,' people who grow up in an environment where it is 'OK to beat, steal and murder'. The second type is the mentally disturbed criminal who looks at his world as threatening. 'A wrong look, one false move, he can explode and become a killer,' he said. The third group are pure psycopaths, a group in which tyrants such as Hitler and Stalin belong. The first would be most criminals. The second would be someone like Seung-Hui Cho or Adam Lanza. The third would be obviously Hitler and Stalin. I would include someone like Osama bin Laden, Eric Harris, and Casey Anthony.