ERIC POSNER

Many, many people exaggerate their accomplishments, blame their failures on others, and misrepresent reality in order to make themselves look better. This behavior is ubiquitous—sometimes intentional, more often subconscious. In ordinary life, we tolerate it, mutely or not, hoping that we are not as bad as the person whose lies we are listening to.

What makes Trump’s behavior seem pathological is that he is the president rather than your neighbor or colleague or negotiating partner. He speaks to audiences of millions rather than to audiences of one or two, and is immediately checked by the press. No president or leader of a developed country has ever acted like him. Most politicians speak from mental (or real) transcripts, which have been carefully vetted so that they offend no one and reveal nothing. Normal presidents lie but only when they expect to be believed because the facts are hidden from the public.

Many, many people exaggerate their accomplishments, blame their failures on others, and misrepresent reality in order to make themselves look better. This behavior is ubiquitous—sometimes intentional, more often subconscious. In ordinary life, we tolerate it, mutely or not, hoping that we are not as bad as the person whose lies we are listening to.

What makes Trump’s behavior seem pathological is that he is the president rather than your neighbor or colleague or negotiating partner. He speaks to audiences of millions rather than to audiences of one or two, and is immediately checked by the press. No president or leader of a developed country has ever acted like him. Most politicians speak from mental (or real) transcripts, which have been carefully vetted so that they offend no one and reveal nothing. Normal presidents lie but only when they expect to be believed because the facts are hidden from the public.