Just as one rotten apple can spoil a barrel, one brutish autocrat can spoil a political union. As Hungarian Prime Minister Viktor Orban has consolidated power and built an increasingly authoritarian regime, he has thumbed his nose at the European Union—and mostly gotten away with it. Over the past few years, Orban has been a mild embarrassment for the union, but in his callous and shortsighted reaction to the ongoing refugee crisis, he has become a disgrace.