The 442 was sent to europe so they would not be confused with the enemy, I'm sure that any knowledge of the Japanese languge was exploited to also confound the enemy.
Many solders of Italian and German ancestry served throughout the European Theater.
"Have we not remembered the lessons so painfully learned in our history?"
We ARE remembering them - when Americans were sent to "resettlement camps" because of their ancestry.
The soldiers killed and wounded in this attack were supporting the highest ideals of a free America where we do our best to guard against treachery, but welcome everyone to become American.