Trump displays signs of “extreme present hedonism,” the tendency to live in the moment without considering consequences, seeking to bolster one’s self-esteem no matter the risk. Or he exhibits “narcissistic personality disorder,” which includes believing you’re better than others, exaggerating your achievements and expecting constant praise. Combine hedonism, narcissism and bullying, and you get “an impulsive, immature, incompetent person who, when in the position of ultimate power, easily slides into the role of the tyrant,”