Josh Paul was the director of the U.S. State Department’s Bureau of Political-Military Affairs until his resignation in October over the U.S.’s policy of lethal military assistance to Israel in the war on Gaza. Standing at the White House podium, U.S. National Security Council spokesman John Kirby was tearing up. “It’s difficult to look at some of the images and imagine that any well-thinking, serious, mature leader would do that,” he said, choking down clear and genuine emotion at the horrors of war. I watched his press conference from my office at the State Department, and I shared his real...