Predatory killers often do far more than commit murder. Many perform their grisly rituals as much for pleasure as for any other reason.
Among themselves, a few forensic scientists have taken to thinking of these people as not merely disturbed but evil. Evil in that their deliberate, habitual savagery defies any psychological explanation or attempt at treatment.
Most psychiatrists assiduously avoid the word evil, contending that its use would precipitate a dangerous slide from clinical to moral judgment that could put people on death row unnecessarily and obscure the understanding of violent criminals.
Still, many career forensic examiners say their work forces them to reflect on the concept of evil, and some acknowledge they can find no other term for certain individuals they have evaluated.
In an effort to standardize what makes a crime particularly heinous, a group at New York University has been developing what it calls a depravity scale, which rates the horror of an act by the sum of its grim details.
(*Sensitive Reader Caution) While not highly graphic, some descriptions of the criminals' acts may be upsetting to sensitive readers or to former victims of abuse.
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hereI do hope that this is in the right CH forum, if not, shout at me and a moderator :-D