Consequently, I put forward the hypothesis that the intensity of the mental health disturbances of any individual resorting to extreme violence is merely indicative of the socialisation of the violence used (Cotter, 2006). In this model, political crime, as represented by Hitler and other Nazi leaders, is associated with low intensity psychological problems (Browning, 1992). Suffering from mild symptoms, Nazi extremists were able to rationalise extreme violence and construct an ideology, disseminated amongst members of targeted groups. On the other hand, in contact crime (where there is physical contact between aggressor and victim, e.g. serial killers), individuals are affected by psychological disorders so severe that they are incapable of building a complex Weltanschauung (a theory of the world) (Jäckel, 1972) to vindicate their use of violence.