In reality there is no such diagnosis as psychopath but it is a widely accepted term to describe a grave form of antisocial personality disorder and doesnt mean that the psychpath is necessarily psychotic all the time...quite the contrary but he will have psychotic episodes in moments of stress and pressure (delusional or in some other sense markedly out of touch with reality) but these are temporal and sometimes hard to detect for poeple around...by the time he started his gaul campaing it is estimated that there were 8 million inhabitants...when he concluded the campaign 2 million gauls were dead and most of them were not warriors...this gives a little impression of how much of a butcher he really was...he had to be a psychopath to be able to do this..only somebody without any remorse or empathy can carry out such things and go home to sell it as something positive... regarding the narcistic personality disorder: Its normally a comorbid condition of antisocial personality and other disorders but can also exist as a sole disorder or a character trait but with borderline personality or antisocial personality disorder it is almost always part of the disorder.
For people interested in these things I can warmly recommend Otto Kernberg: Borderline-Conditions and Pathologic Narcissism
http://www.amazon.de/Borderline-Cond...cal+Narcissism
The trick of the psychopath is to give others the impression that all the evil comes from elsewhere.