Speaking of a German perspective, they were treated extremely well in terms of prisoners. They were used to farm and do agricultural work in small towns in the south and midwest. Always under guard of course, they usually didn't try to bust out however as they had it made. They went to work, were fed very well, had entertainment (films) and were on vacation from the war. Many wrote home saying they were being treated extremely well and if they had known about the treatment, would have deserted earlier. These were of course, censored when they were found but some did make their way to their destinations. For the Japanese however, it was a different story. They were regarded as animals almost, as the cruel things they did to our prisoners were put in news and propaganda. They received harsher treatment from guards, but all the same were also fed and kept alive. German's loved it in the US and many stayed after the war. Japanese ( who not many were taken prisoner) went home as dishonorable and disgraceful. Some killed themselves, others kept quiet.

There was in 1945 a murder when one man, angered at his position guarding Germans and not killing them overseas, decided to open fire into their tents where they were kept rather than watch them. He killed quite a few of them before he was stopped. I believe he was sent to prison and dishonorably discharged.