I'm confused why so many commenters are quick to shout "B.S" on this article (are they BSers in hiding?) but maybe he is oversimplifying too much. True S-W types are pretty rare and are probably evidence of some extreme psychological disorder. (E.g., malignant narcissism or sociopathy. Robert Hare is a researcher in criminal psychology and wrote a book on such people: https://www.amazon.com/Snakes-Suits-When-Psychopaths-Work/dp...).