The question of whether to bomb the Islamic Republic of Iran into oblivion has been much on the minds of decision makers in Washington. The most obvious alternative is to let Tehran slouch toward oblivion all by itself. Iran’s currency is sliding toward zero; its “Axis of Resistance,” the military strategy that appeared invincible just two years ago, has been wrecked by an Israeli-led campaign of assassinations, bombings, and exploding beepers; its people want to kill the supreme leader, Ayatollah Ali Khamenei, and are worried that biology (he is an 86-year-old cancer survivor) will get to him first. “There is...