The Narcissist vs. Antisocial.

Narcissistic Personality Disorder NPD is rarely comorbid with Antisocial violent conduct. However, if in childhood, violent conduct tendencies, and unempathic self-absorption behaviors are apparent, then yes, the NPD person can be extremely dangerous. Antisocial Personality Disorders ASPD previously referred to as psychopaths, are always Narcissistic, but unlike NPD have no regard whatsoever for the overseeing general value system or the Law, similar to NPD no regard for anybody around them. ASPD are absolutely primal, governed by drives and impulses and lives with the sole purpose to feed these instincts. NPD individuals however, may have internalized the general Law or their cultural value system that is abstract and coldly thus comfortably distant from them, however they utterly disregard the values and principles of people directly thus uncomfortably around them. So, there is a thin line between Narcissism and Antisocial Personalities. Murder is quite different from merely breaking the law, and  may of course be terribly hurtful to someone. But taking someone's life is the ultimate in exerting control over someone, utterly disregarding their life and in fact become exhilarated in removing it . Taking someone's life is exerting the utmost control over them in annihilating their existence, in this very way APD experience a godlike mania in extreme beyond a shadow of any doubt. They have no one to answer to, no guilt what so ever, completely unempathic, devaluing existing laws and creating their own they feel are much superior and surpass any other that interferes with their own, since these their own laws are in place to directly feed their own instincts, drives and desires.  They are utterly selfish and self-involved and of course extremely dangerous. But their most dangerous characteristics of all is not the obvious, but the unobvious. They are very often strikingly attractive individuals.