I have that book. As I recall she says that 1 in 24 are socipaths, after reading her book I would say that the percentage is much higher among politicians than the general population. I believe obama is a sociopath.
Narcissism defined by the DSM-IV shares traits with sociopaths, like lack of empathy.
My take is that narcissists screw people over every way they can within the law, and many can be considered “successful”, as in become political leaders or have lucrative careers.
True sociopaths lack self control and end up killing folks until they are caught.