'Israel,” Iran's Supreme Leader Ali Khamenei said four years ago, “is a cancerous tumor” that “will undoubtedly be uprooted and destroyed.” As subsequent events proved, he meant what he said. The turbaned cleric and his regime were major players in the war that Hamas's October 7 massacre sparked. Now, as the war draws to a close, three questions arise:How much was this war Iran's doing; what is Iran's cost-benefit balance in its aftermath; and what should the world do about Iran?IRAN WAS