I spoke with a number of veterans about this , years ago. They were unanimous that they were willing to fight and possibly die only to defeat Hitler and Japan.
They were of the same mind that If we had tried to make common cause with Germans to attack the Soviets, much of the U.S. military would have mutinied.
My father’s army engineer battalion was the first one sent to the pacific after Pearl Harbor. After Japan surrendered, McArthur picked this battalion for Japan Occuptation duty. The troops got together, and sent a delegation of the senior NCOs to the highest ranking officer on Okinawa at that time. The delegation told him that if orders were given to go to Japan, the battalion troops would just get the nearest ships and aircraft, and go home. Navy, merchant marine and army air force officers had already said they would take them before anyone else.
The army gave in. What else could they do? The were facing mass mutiny by far more units than my fathers battalion. Thousands of troops got on the nearest transport home without orders as it was.
I wonder how many felt when it came time for the Korean War?
And thousands went to Japan. What’s your point?
My late father was a Marine. He fought in Guadalcanal and Bougainville. He had to be sent to a hospital back in the states(nothing extremely bad but bad enough) He was scheduled to go back to the Pacific for the invasion of Japan when the bomb dropped. He was grateful for the bomb.
In the 90s he bought a Toyota. “The wars over “ he said.