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Using atomic bombs against Japan doesn't carry the same risk as Japan cannot hit the USA or Britain with weapons of mass destruction.
By spring of 1945, what allies did Germany have ? And that situation would not of been any better by August.Germany and her allies will capitulate if they are offered something better then national destruction followed by Soviet occupation. Otherwise they will fight as long as they have weapons and ammunition. Atomic bombs don't change that equation.
Sorry guys, you are thinking like modern people. In WWII, almost nobody knew what a Atomic Bomb was or how much damage it would do.
So you really think Harry Trumman would have hesitated to drop an A-bomb on Germany if he had it sooner?
They knew so little about it at time that they were fliming a movie downwind from the first A-bomb blast in New Mexico at the Trinity site. Most of the people in that movie, including John Wayne, eventually died of cancer later, probably due to radiation fallout from the blast. I'm pretty sure Harry Trumman didn't realize the long-term effects of an A-bomb in 1945. He would have used it if he thought it would shorten the war.
There were factions in Germany who wanted to capitulate long before the the actual surrender. My bet is that the threat of a nuclear bomb after what happened in Japan would have made most of the die hards in Germany ready to give up and if Hitler had stood in the way they would have disposed of him. To think that the leaders in Germany were any more fanatical than those in Japan is IMO incorrect.