Contrary to the popular belief that power corrupts, research suggests it acts as an amplifier. If a person is already "pro-social"—oriented towards helping others—power can increase their empathy and effectiveness. If they are selfish, power will magnify those negative traits.

People with dark personality traits often self-report them honestly on questionnaires. They don't see being callous, manipulative, or superior as negative characteristics, so they feel no shame or remorse in admitting to them.

Electoral systems have an adverse selection problem, favoring narcissistic, Machiavellian, and psychopathic individuals who seek power. A lottery system, by contrast, selects a more representative and less pathologically power-hungry group of leaders, avoiding those who excel at manipulative charm to get elected.

Companies often cannot differentiate between healthy confidence and narcissism. Narcissistic individuals excel at self-promotion and appearing decisive, which are frequently misidentified as leadership qualities, leading to their accelerated advancement over more competent but less self-aggrandizing peers.

Within the 'Dark Triad' of personality traits, there is a clear hierarchy. Psychopathy is an escalation of narcissism. All psychopaths exhibit pathological narcissism, but many narcissists do not possess the additional traits of psychopathy. Narcissism is a necessary, but not sufficient, condition for psychopathy.

The problematic aspects of narcissism, like grandiosity and entitlement, are components of a larger personality trait called antagonism. This trait involves intentionally putting people at odds with one another to maintain a hierarchy and create drama.

Mapping Trump solely as a self-serving politician is incomplete. His behavior is better understood as a combination of a narcissist who seeks power and a patriot who genuinely wants to impose law and order, leading him to use extreme methods.

While related, narcissism and psychopathy have different core motivations. A narcissist's engine is grandiosity at the expense of equality—they need to be on top. A psychopath's engine is the exploitation of others at the expense of any sense of honor or human value. They see people as objects, not inferiors.

Having a large online following can force a narcissistic defense. The brain's threat-detection circuits are wired to ignore thousands of positive comments and fixate on the one negative one. To protect against this constant perceived attack, individuals must develop a narcissistic shield.