From the book, Thinking Fast and Slow (Kahneman, 2011):
You will from time to time meet a patient who shares a disturbing tale of multiple mistakes in his previous treatment. He has been seen by several clinicians, and all failed him. The patient can lucidly describe how his therapists misunderstood him, but he has quickly perceived that you are different. You share the same feeling, are convinced that you understand him, and will able to help. [...] Do not ever think of taking on this patient! Throw him out of the office! He is most likely a psychopath and you will not be able to help him.
Is it true, and if so, why, is such a person 'most likely a psychopath'?
Kahneman, D. (2011). Thinking, Fast and Slow. New York: Farrar, Straus and Giroux