The model is inherently flawed, because it does not take into account psychopathy, which has been scientifically understood only in modern times. The pure psychopath—someone at the top of the checklist score—would be the closest thing we have to a true NPC. However, psychopathy is on a continuum of severity among the population. Most of us probably know, or have known, several people who score high in some of the characterstics measured but who do not create much trouble.