President Donald Trump disembarks from Marine One on the South Lawn of the White House in Washington, Sunday, March 15, 2026, after a trip to Palm Beach, Fla. (Eric Lee/The New York Times) By NICHOLAS KRISTOF Suppose Iran dispatched operatives to Mexico, where, from the Texas border, they fired a missile at an American base and, unintentionally but carelessly, demolished a nearby American school, killing 175 people. What if they then blew up fuel depots, showering a chemical rain on...