Understand well that sociopaths need to recruit MORE sociopaths - those without conscience, as they need people willing to view their fellow human human beings without compassion, to view them as cattle, so they have someone to do their dirty deeds..
Sociopaths band together naturally, seeing each other as those that really 'get' it... (and act for mutual survival out of necessity being normally a small minority) as long as there are sufficient normal people to exploit.
The incidence of psychopathy is less than 1% that is genetic, or pathological (structural). There is an additional 6 percent due to learned conditioning, as a survival response, to having to deal with proximity to a psychopathic leader, boss, president, etc.. The latter respond to therapy, the former must be incarcerated.
Good stuff, Arnie. This fits in well with other facts posted on this thread. The book sounds fascinating.
Here's another great book about sociopaths, by the author of "The Road Less Traveled", with full details of clinical appointments with a sociopathic client over a period of years - "People of the Lie":