It's amazing that a group of men so persecuted and vilified had the guts to prove themselves in battle. Faced with signing loyalty oaths of being deported, many brave lads signed up to fight their ancestral country.
I always knew there was a regiment of Japanese-American soldiers who earned more than their share of medals, but perhaps in the "anti-war" hysteria of the Vietnam Era, we've forgotten that risking one's life in combat is one way to show your patriotism.
This movie was released only 6 years after the end of WWII, so there was no cover-up. Another good movie to watch is Farewell to Manzanar (or read the book).
One good thing about Americans is that we're able to put ourselves in another person's shoes and consider what it would be like to be them. This empathy is chiefly what has kept us from committing the large-scale atrocities of our WWII enemies: Hitler, whose Nazi goons killed over 9 million civilians in concentration camps; Japan, responsible for the Rape of Nanking, the Comfort Women episode, and who had planned a wide-scale massacre of Japanese Christians in their own country.
No one "cheers" about the atomic bombs, or is proud of the internment camps, but let's try to keep things in perspective. And let's remember to honor the brave Nisei and others who formed the 442nd Regiment.