Although history affords us innumerable examples, they are so common in the society around us that one does not have to go into a study of mass murderers to find them. The phenomenon is by no means rare and at the absolute minimum is 2½% of the population. This individual fills the institutions with victims, the hospitals with the sick and the graveyards with the dead. The statistics of psychosis are not going to lessen in the society until this type of personality is completely isolated and understood.
Suppressive Person Doctrine 