Despite polls that consistently showed Donald Trump running a competitive race in 2016‚ his winning the presidency came as a shock to most of official Washington‚ the media‚ and other “sense-making” institutions in this country. The sight of such a norm-breaking figure taking the highest office in the land seemed to unscrew the loosest screws. Trump’s behavior — whether throwing a Starburst candy at Angela Merkel (“Don’t say I never give you anything”) or tweeting about how his nuclear “button...