If Caligula were the president of the United States, Taiwan’s leader William Lai Ching-te might still kowtow to him. By now, it seems pretty clear that US President Donald Trump has no real policies to speak of, only caprice and vague ideological preferences. That was how bad emperors acted, and Trump obviously sees himself as some kind of king, unrestrained by anything other than his personal inclinations. It’s not surprising there have been “No Kings” protests across the US. From his lifelong....