The prediction that Iran will be America’s next Vietnam—a moral catastrophe, an abyss into which money and lives have been pitched, with the sole effect of weakening the United States and heartening its enemies—is already in general circulation among Americans. A few days ago, the Iranian embassy in Hanoi joined the doomsaying. Its X account featured an AI-generated image of a mouth-breathing American GI being lectured to by a smiling Vietnamese soldier in Saigon on April 30, 1975. “We thought