It is known that a high level of psychopathic traits in a person is associated with a risk of violent behavior. This is not surprising, as psychopathy is expressed by a decrease, or even a complete suppression, of a person’s natural internal resistance to causing harm to others. However, few know how psychopathic traits are distributed in the general population and how strong the link is between them and the capacity to commit acts of violence. Some may be surprised, but as numerous studies demonstrate, the majority of people do not possess even the slightest psychopathic traits.
A study of 638 individuals from England, Wales, and Scotland demonstrated that 70.8% of them exhibited a zero level of psychopathy according to the PCL:SV test (scale from 0 to 24). The average psychopathy value was 1.52 for men and 0.63 for women. Only 2.3% of people had a psychopathy level of 11 and above, and only 0.6% had 13 and above, which indicates potential or subclinical psychopathy. However, a level of 18 would be a trait of definitive psychopathy, which only one person in the entire sample reached. A semi-normal distribution of psychopathic traits for the general population can be observed, in which a zero score is the mean for the distribution [1].
A similar American study examining 514 people living in the same county demonstrated that more than half of the people had a level of 0 or 1, and two-thirds had 0, 1, or 2. The average level was 2.67 (3.53 for men, 2.16 for women, 1.70 for whites, and 3.86 for African Americans). A level of 13 and above was obtained by only 1.2% of people (1% of men, 1.2% of women, 1.9% of African Americans, and about 1% of whites) [2]. Among American managers and company executives (sample of 203 people), the vast majority (80%) had a level from 0 to 3 on the PCL-R test (scale from 0 to 40). Only 9 people (4.4%) had a level of 25 and above (potential psychopathy), 8 of whom (3.9%) had a level of 30 and above (definitive psychopathy). The average level was 3.64 [3].
A completely different situation is observed among violent people. In one study, 98 men undergoing forensic psychiatric examination and accused of violent crimes showed an average level of psychopathic traits on the PCL-R equal to 21.4. And only 9 people (9.2%) had a psychopathy level below 10 [4]. A similar Swedish study with 43 men, 74.4% of whom were accused of violent crimes, demonstrated an average psychopathy level equal to 23.08 [5]. There is also a current study of murderers sentenced to death in California. For them, the average psychopathy level was 23.31. Only 15% of the individuals considered had a level of 10 and below. Among them were those who had not committed crimes previously, repented for their actions, and behaved in accordance with judicial norms. Individuals with higher psychopathy scores behaved much worse. And 5 people who scored a maximum of 40 points were the most brutal criminals—serial sexual murderers [6].
Additionally, one study provides a meta-analysis of 22 studies with 29 unique samples of murderers from 6 countries: USA, Canada, Sweden, Finland, Germany, and Brazil. It determined that the average level of psychopathic traits in murderers according to the PCL-R test is 21.1. At the same time, it is noted that for people who do not commit crimes, it is only 5.1 [7].
As the authors of the studies note, in the vast majority of people, psychopathic traits are completely absent or expressed to a small degree. Violence and murder have a strong link to them, and the higher the level of these traits, the more brutal violence can be expected from a person. This once again confirms that the commission of acts of violence is pathological behavior, the result of a failure in the correct functioning of the violence inhibition mechanism, which leads to the emergence of psychopathic traits. Everyone should understand that violence is a disease.
