Iran has achieved a singular statistic in its current front against Israel. After firing more than 400 missiles over nearly a month, Tehran apparently hasn’t hit a single Israeli military target. That leaves the Islamic Republic with a 100% civilian casualty ratio—a benchmark of the number of civilian casualties relative to combatant ones. Not long ago, civilian casualty ratios were at the heart of discussions of the Israel-Gaza war, with Israel’s critics claiming that “disproportionate” levels of civilian casualties were evidence of war crimes. In reality, Israel’s infliction of 30% to 40% military casualties on an adversary hiding behind civilians...