I've heard that "Sociopath next door" is one of the most recommended books for anyone that want's to understand sociopaths and how to recognize them before they can do you some harm. In my experience the sociopath did not see herself as a sociopath. One big question she had, was why none of her past relationships ever lasted. Based on the recommendations I had read about that book, I told her she should read it if she really wanted to understand and improve her chances of having a better relationship with any man. However, knowing her the way I do, I'm pretty sure she didn't take my advice. One theory I've been working, is that sociopathy is not an either or condition. It is more like a spectrum or range of conditions that fit into the category of sociopathy. Many of those conditions are only mildly impacting and usually remain unrecognizable to others. Even the more server conditions of it don't get much attention unless those individuals are noticeably breaking the law and putting themselves on the radar of society. You mentioned 4% of the general population is sociopathic. I too would question that statistic as I think if the complete spectrum of sociopathy could be reasonably calculated that number would be closer to 10% IMO.