Capt Worley PE
Run silent, run deep
Psychopathy is a personality disorder that has been variously described as characterized by shallow emotions (in particular reduced fear), stress tolerance, lacking empathy, coldheartedness, lacking guilt, egocentricity, superficial character, manipulativeness, irresponsibility, impulsivity, and antisocial behaviors such as parasitic lifestyle and criminality.
http://theweek.com/article/index/251957/which-professions-have-the-most-psychopaths