4.5% of adults are psychopaths

Spanish psychologist Maria Garcia-Vera was able to find 15
scientific articles that talk about the number of psychopaths
in society, prisons and different professions. Scientists have
at their disposal data on 11.5 thousand people with symptoms
of psychopathy. After examining the information received, the
researchers were able to tell where and how often psychopaths
can meet. It turned out that psychopaths are in high positions.
According to the authors of the scientific work, at the moment,
4.5% of the adult population of our planet have psychopathic
personality traits. In most cases, psychopaths are men, not
women. Psychopathic traits such as manipulative tendencies,
callousness, and lack of guilt are common among people in
high-ranking positions: company directors, lawyers, surgeons,
politicians, and so on.
As a rule, psychopathy develops in childhood - children growing
up in a criminal environment are especially susceptible to it. To
diagnose psychopathy, the 20-item Psychopathy Scorecard, 
eveloped in the 1970s, is used. 5 most striking points of the sheet:
superficial charm, shallow charm; tendency to deceit and fraud;
lack of feelings of guilt and regret; irascibility, poorly controlled
outbursts of anger; irresponsible attitude to their own actions.
But it's important to remember that not all psychopaths are serial
killers, and not all serial killers are psychopaths.