A sociopath is a person who has no moral compass, no power of empathy to feel with or for others. Moral right and wrong are simply categories they don't access and probably can't.
Ayn Rand wrote several books that are bedside reading for some powerful men in Washington. Alan Greenspan sat at her feet and absorbed her philosophy and Clarence Thomas loves her work so much he requires his clerks to read it.
Ayn Rand modeled her superhero, John Galt in Atlas Shrugged on a serial killer of the day, Edward Hickman. Hickman killed and dismembered a 12 year old girl. Rand gushes about him, "Other people do not exist for him, and he does not see why they should. He had no regard whatsoever for all that society holds sacred, and with a consciousness all his own. He has the true, innate psychology of a Superman." Another hero, Howard Roark (in The Fountainhead) is described thus: "He was born without the ability to consider others."
Her philosophy is a distorted derivative of Neitsche's Superman ideas, but it is filtered through her enneagram style. She is a subtype of style One, self-preservation. Ones derive their morality from internal principles, not social norms. They are reformers and critics of social norms. Ones live by inner rules that they consider binding on everyone. Rand's philosophy is an elaboration of her unhealthy enneagram style. Ayn Rand created heroes and a "philsophy" that spelled out the bleak, heartless inner life of a sociopath.
When a One is a sociopath, as Ayn Rand is, then the internal rules are absolute and other people do not matter. Clarence Thomas, an obvious One, frightens me. He does not ask questions in the supreme court; he goes by his own vision and is largely unmoved by the opinion or information of others. I don't know that he is quite a sociopath, but seems very unhealthy. Donald Rumsfeld is probably another example of a sociopathic One.
Ones are not sociopathic more than other styles. Obama, Hilary Clinton and McCain are all healthy Ones. They are all convinced the world should operate the way they think, though. That's what reformers are all about.