Most Evil is an American forensics television program on the Discovery Channel starring forensic psychiatrist Michael Stone from Columbia University. On the show, Stone rates murderers on a scale of evil that he has developed in order to help science understand and thus prevent this type of behavior. The show features profiles on various murderers, serial killers, and sociopaths. Stone researched hundreds of killers and their methods and motives to develop his hierarchy of "evil." The scale ranges from Category 1, those who kill in self defense, to Category 9, psychopath jealous lovers, to the "most evil" Category 22, serial torture and killers (for example; Westley Allan Dodd was among those classed as Category 22). Neurologists, psychologists, and other forensic psychiatrists are interviewed on the show in an attempt to examine and profile the minds of notorious killers.
Evil exists. it's just that the Devil isn't the guy pulling their strings.
Evil is a combination of nature and nurture.