At a town hall event in Philadelphia late last week, former Vice President Joe Biden was asked what he thought of America's foreign policy under the Trump administration. "You see what's happened," he lamented, "in everything from Belarus to Poland to Hungary, and the rise of totalitarian regimes in the world, and as well, this president embraces all the thugs in the world." With that half-insulting, half-clueless remark—counting Poland and Hungary among the "totalitarian regimes in the world"—Biden set off a small diplomatic firestorm. Or he would have, if these were normal times, and if insults to Poles and Hungarians...