I took judo lessons when I was a kid at the Salt Lake Judo club. Lots of Japanese black belts, one of whom was a former imperial pilot. I asked him how he felt when the war ended and he said pretty good. He explained that he was in training as a kamikaze pilot, an assignment he had not volunteered for. It was a real revelation for a 13 year old kid, and I realized that they were just people too. Then came the RVN war where I unlearned my newfound humanity. Life is complicated.
I asked my friend Hans and his Wife one time when she was still alive how they were treated when they immigrated to the USA where they could be neighbors with people who died fighting the Germans.
Both of them said they never experienced any discrimination based on Hans fighting for Germany and were solid American Citizens.