The single-most decorated U.S. Army combat brigade during WWII was composed of Nisei Japanese-Americans. Even for the persons who actually immigrated from Japan

The single-most decorated U.S. Army combat brigade during WWII was composed of Nisei Japanese-Americans. Even for the persons who actually immigrated from Japan, why else would they have come over if not because they saw something better? They can't all have been fifth columnists sent to blow up planes in hangars. However a simpler response is to point out that we did not inter German-Americans, Italian-Americans, immigrants from Bulgaria or Romania, etc., despite there being a much less clear reasoning for war with the European Nazi powers.