Most Helpful Girl
You need to read a new book your info is way off. Many sociopaths are criminal geniuses. Psychopaths are often heads of corporations and world leaders. Their psychopathy fits a respectable role.
Most Helpful Guy
It's actually not really much of anything, usually. "Mental illness" is a very subjective term with very subjective standards of control and diagnosis. I could easily convince people that I was "mentally ill" if I decided to on a whim, despite not being so. Diagnoses are based purely on external, observable factors that can be judged, again, subjectively. What *I* would consider mentally ill may be completely disregarded by someone else, and vice versa. Basically medical professionals need to stop over-diagnosing people with illnesses that mostly don't exist.