From the abstract, I read this as "despite the awful conditions and murderous labor, we still performed and sang and the guards didn't stop us." I will argue that this is far removed from Japanese internment camps who were either allowed to bring their own instruments in or they were provided by the camps. I think your main point is "forced internment is retarded" but comparing it to places like Auschwitz just makes the Japanese internment camps feel like summer camp, and that much more acceptable.
George Takei once joked when people were arguing if Santa was white that he remembered seeing Santa in the internment camp, and Santa was Japanese. The Japanese celebrating a Christian holiday shows how many of them WERE assimilating into American society, but the fact that they got to practice religious events at all shows a level of freedom they were given.
Meanwhile the jews in the camps were singing sad songs about the time their Polish town was burned down during a pogrom. They continued in spite of the hardship, while the Japanese in the camps experienced no such hardship, which is why they look clean and happy in the band photo you posted.
