The Kennedy Center Honors are the nation’s top performing-arts-achievement awards and their celebration the highlight of the capital’s cultural calendar. Yet the honorees are typically announced in that most artless of ways — a press release. Not this year. You’d think liberals who decry conservatives as contemptible Philistines would be pleased to see a Republican president focus the country’s attention on the arts with something of a show itself. But no — not when that president is Donald Trump. They slammed the selections too, though the list isn’t much different from those under Democratic presidents such as Barack Obama —...