In some ways the victory of Donald J. Trump would never have been conceivable had America not withstood, survived and then assimilated the coarseness of the Naughty Nineties. How else would the electorate have been comfortable with a thrice-married President who had a fondness for fashion models, a history of hosting beauty contests and a string of accusers describing harassment, unwanted advances or assaults (all of whose claims he denied)?