WHEN AN ARGUMENT has lost all moral footing, ignores all empirical fact and delights in willful ignorance, it usually only has one tack in the face of courage and truth—to delve ever-deeper into immorality, falsehood and ignorance. Such was the case in America’s “welcome” of Greta Thunberg, the 16-year-old Swedish climate activist who is inspiring youth across the globe. Thunberg’s opponents…