Let's say you were a US Marine on Iwo Jima or Okinawa with the prospect of invading Japan in a few months. Would you want your president to be concerned with freedom in Poland or would you rather have the Red Army pin down several million Japanese soldiers in the Far East?
Who knew if the A-bombs would work as well as they did. We could have dropped some, and the Japanese could say, "Is that all you got."
Let's not forget that Nazi Germany did not surrender until a Soviet T-34 was on top of Hitler's bunker in Berlin.
If you were alive in 1944, who would you have thought were the bigger fanatics, the Germans or the Japanese?