Recent comparative research on the Dark Triad has attempted to analyze differences among these three malevolent personalities. To varying degrees, all act aggressively out of self-interest and lack empathy and remorse. They’re skilled at manipulation and exploit and deceive others, though their motivations and tactics vary. They violate social norms and moral values and lie, deceive, cheat, steal, and bully. It’s thought that genetic factors underlie their personality to some degree.
Machiavellianism and psychopathy are more closely correlated due to their malicious behavior; whereas narcissists are defensive and more fragile. This is because their grandiosity and arrogance is a façade for deeper feelings of inadequacy. (See “Relationships with Narcissists.”) Men outnumber women, primarily when psychopathic traits were measured (i.e., not just deceit, manipulation, etc.). This difference is linked to the overt antisocial behavior associated with psychopathy, suggesting that it may be due to biological factors, such as testosterone, as well as social norms
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