In fact, we make the exact same normative claim in the end (that internment was wrong).
Japanese Americans also willingly enlisted into the U.S. military to fight the Japanese. They reportedly fought harder, fiercer, and put on riskier missions. But this wasn’t used as counter evidence against internment. Because again, internment is based on unreasonable, reactionary bigotry, and literally nothing else.
Black Americans were commonly assigned as cooks, orderlies, and other roles outside the normal military structure. It's why Black American veterans were largely excluded from the GI Bills after the war.
Folks really don't grok how overtly racist the US could be within living memory let alone further back. Too bad US schools don't teach it adequately and are poised to suppress that history even further of late.
With teaching, there is always the question of what the priorities are, and what the emphasis is in terms of message.
Out of curiosity, what do you think the lesson students should take away from the Japanese internment is?
Here is the section on it from a standard US history textbook that was posted elsewhere in the thread:
https://www.mrginn.com/uploads/8/5/4/6/85468970/chapter35.pd...
"It wasn't bad because it happened to Black folks or Jews or American Indian tribes. 'Never again' shouldn't mean, 'Never again exactly how it was done last time.' It was horrible because they were human beings. It was horrible because folks went out of their way to stop viewing them as human beings. And here are some reasons why people back then (and today) justified these acts, so that when similar conditions arise again—because while history does not repeat, it certainly rhymes—we can learn to recognize and hopefully prevent these atrocities before they start next time!"
That's the lesson I'd love to have taught. That no is perfect. History is the diary of a madman. Learning not just facts but also the motivations/context of historical events, so as a society we can potentially help avoid future problems and move along with less needless suffering.
Learning that Nazis aren't cartoon villains does negate the necessity of choosing to highlight they were horrifically bad in the historical timeline.
Simply judging is indeed insufficient for learning but it is also a necessary component. Otherwise you get folks who even today assert that "slavery wasn't that bad," "the Civil War wasn't about slavery or racism," "I think nationalism is a good thing," and "our race and culture are under attack due to immigration and white genocide."
I'm not making the claim that the conclusion that WWII U.S. governments came to was right (in a moral sense), or correct (in that it was going to reduce the probability of sabotage given their knowledge at the time), I'm making the claim that knowing about Ni'ihau makes their actions make more sense. It is an important piece of context. It allows you to better-understand their state of mind and the state of the world while they were making these decisions.
But not all cultures fall victim to the madness, typically not when they learn and acknowledge the sins of the past.
Not holding those living today for the sins of the father, but also not shying away from pointing out the sins of the father.