The rising tensions between Iran and Israel have provoked understandable foreboding. On April 1, an Israeli airstrike killed a senior Iranian commander in Damascus. Last weekend, Iran responded by launching more than 300 drones and missiles at Israel, which in turn prompted Israel to strike targets in the Iranian city of Isfahan on Thursday night. As the two historic antagonists climb the tiger’s back, the Biden administration is hardly alone in fearing a regional conflagration. The Islamic Republic seeks revenge for its dead, while Israel needs to restore deterrence, badly damaged by Hamas’s Oct. 7 assault. If Israel fails to...