There were not nearly as many Japanese Americans as there were immigrant or first-generation Germans, and yet the latter were not noted for their devotion to death and destruction.
If you want to replace your rank speculation with some real-world examples of Japanese American behavior during WWII, a good place to start looking might be the 442nd Regimental Combat Team.
The fact is, the internment of Japanese Americans -- many of whom were 3rd-generation Americans -- was indeed a national shame, in the same way that the Cherokee "Trail of Tears" is a national shame. It has long been recognized as such, across the political spectrum.
My great grandparents were from Poland-Germany. During the wars they made sure to live in strictly Polish neighborhoods and only speak that tongue, rather than any German.