A new edition of Tucker Carlson’s newsletter is drawing sharp backlash after he argued that an Iranian nuclear weapon could ultimately be a stabilizing force in the Middle East, prompting critics to accuse him of echoing narratives friendly to the Islamic Republic. In the essay, Carlson reportedly contends that the chances Tehran would ever launch a nuclear strike are effectively zero, describing the use of such a weapon as “suicidal” for any regime. He contrasts that with the United States, noting it is the only country to have used nuclear weapons in war, and suggests Washington treats that history as...