The killers' characteristics referred to as antisocial personality in the FBI report were as follows: sense of entitlement, unremorseful, apathetic to others, unconscionable, blameful of others, manipulative and conning, affectively cold, disparate understanding of behavior and socially acceptable behavior, disregardful of social obligations, nonconforming to social norms, irresponsible. These killers were not simply persistently antisocial individuals who met DSM-IV criteria for ASPD; they were psychopaths- remorseless predators who use charm, intimidation and, if necessary, impulsive and cold-blooded violence to attain their ends.