never ever ever trust a "psychological" study. First, it's all numbers magic with very little connection to actual lives of people. Second, those numbers that come out 100% depend on the categories the resrearchers put in. Categories are human inventions and depend on what the people doing these things believe to be a category, and then they sort people and actions into these categories without any understanding of historical and situational context these people actually find themselves in. Third, "psychopathy" in this line has always been an invention to locate everyhing that disturbs a historically, materially produced idea of "normality" and claims that the reason lies somewhere deep within the person (and not the situational surroundings, socially leaned judgments of others, etc.), which then reinforces the idea that said "normality" is natural, which is - empirically clearly demonstrable - is not. Fourth, these are then tools to produce facades of "see? everyhing we say is normal IS normal, because look, those people we already don't like are "psychopaths"! - which historically has been the role of psychiatry, there is a mountain of social science literature on what psychiatry has empirically done in history, which is exactly that: re-ensure those that are socially "approved of" that those who are not socially aproved of "have a fault". ten foot pole.