Reduced GM [ grey matter ] volume within areas implicated in empathic processing, moral reasoning, and processing of prosocial emotions such as guilt and embarrassment may contribute to the profound abnormalities of social behavior observed in psychopathy.
Evidence of robust structural brain differences between persistently violent men with and without psychopathy adds to the evidence that psychopathy represents a distinct phenotype. This knowledge may facilitate research into the etiology of persistent violent behavior.
I think its important to make distinctions between what we consider conventionally anti-social (the gangster) and psychopathic/ sociopathic (the serial killer). This is feasible given the advances made with tools to measure neuro-correlates. Neuroethics is a cool emergent field.