Douthat: Trumpism is doomed without restraint

There are two ways to react to Donald Trump’s latest spurt of mad-king behavior, as he tries to bully and meme his way to the acquisition of Greenland under the threat of a trade war if not a real one.

The first reading is straightforward: This is malignant narcissism flavored with insane Nobel Peace Prize-related self-pity, the usual Trumpian unfitness magnified by the excitement of his Venezuelan intervention and the vicissitudes of old age, with the entire NATO alliance imperiled by...