The podcast, part of Carlin's excellent Hardcore History series, is called "The Destroyer of Worlds". The podcast has convinced me that Truman was a horrible president. After the United States had a monopoly of atomic weapons our two sane courses of action would have been to either maintain this monopoly by threatening to go to war if another nation developed atomic weapons, or to have made an all out push for peace with the Soviet Union to avoid a future arms race. Instead, Truman used the monopoly to engage in short-term bullying of the Soviets, while doing nothing to hinder their development of atomic weapons thus guaranteeing that they would eventually have thousands of atomic weapons aimed at us. I bet in most branches of the multiverse arising out of 1953, millions of Americans die in nuclear war by 2017.