Mélenchon’s rallying cry of “peace” on Earth sounds laudable, but his success would have severe consequences for Europe. Pulling France out of Nato and out of EU treaties, which he wants, would unravel Europe’s architecture. It would mean a leap into the unknown, not unlike that advocated by Le Pen. His radical economic policies would kill any hope of reforming eurozone governance. Meanwhile, his vision of international relations—in which Russia’s revisionism over European borders and the Syrian dictator’s mass killing of his own citizens hardly get a mention, whereas western democracies are constantly critiqued—smacks of moral confusion, and much worse.