Japan ready to capitulate?
I see the movie plays on the peace overtures that Japan made, as if that made the atomic bombings unnecessary to get them to accept unconditional surrender (and they never did surrender unconditionally, as they kept their Emperor -- a war criminal who actually was a conscious patron of the poison gas unit commiting atrocities on Chinese).
The U.S. dropped the bombs on August 6th and 9th. JAPAN SURRENDERED ON SEPTEMBER 2nd. That was three weeks later! Between August 9th and the surrender, the U.S. continued its fire bombings of Japanese cities (one USAF general said that if they left one paper *beep* left standing in Tokyo, he should be shot; it wasn't Curtis LeMay). The country also ran out of oil, as the U.S. submarines had sank all its merchant shipping. The opportunistic Soviets also came into the war.
Those two bombs didn't stop the war. Isn't that incredible? They might have helped Japan be nudged along towards surrender, but even after those two bombings, they kept the war going. (So much for dropping a demonstration bomb.)
Truman, who made the decision, knew that dropping Atomic Bombs on North Korea and China wouldn't have done a f-----' thing, and that's one of the reasons he called General Dugout Doug MacArtnur, who wanted to use nukes in Korea, a dumb SOB and sacked him. (He relieved him because he defied the Commander-in-Chief, but he did that as he was a dumb SOB.)