Quoting extensively from Dr. Roy Swank and Dr. Walter Marchand’s 1946 study done for the U.S. Army regarding combat effectiveness of troops it was noted in every instance those who were still effective after 30 days of continuous combat were that 2% who had psychopathic tendencies. So why does Dave Grossman continuously refer to the 3% of Americans as psychopaths? Because the missing 1% are those psychopaths completely unsuitable for any military structure. And among them are the PCL-R criminal psychopaths. There were other psychopaths not even in the study, the ones who were in critical elements of industry and politicians. And this demonstrates why Cleckley stated that more than 4% of the American population were psychopaths.
Based on 3+% psychopaths (remember Cleckley estimated over 4%) and a USA population of 318,000,000 people equals at least 9,540,000 psychopaths.
https://medium.com/@BearlyJim/what-percentage-of-the-population-are-psychopaths-and-what-is-their-most-frequently-chosen-721c1a64c26b