He labels as evil those parents who present a normal social persona to shield the harm they do in private. They serve their own needs and desires at the expense of their relatives, especially their children. The more pleasure they derive from acts of torment, the more they indulge. Indeed, Stone reserves the “most evil” category—level 22—for psychopathic torture-murderers, with torture as their primary motivator. They thrive on inflicting pain.
