Ultimately, the federal courts decided, forty years later, that Roosevelt's Executive Order to round up the Japanese-Americans was unconstitutional. A link earlier in this thread has both of the Korematsu decisions, the original one in which the Supreme Court (to its eternal shame) upheld that order, and the final one which expunged the conviction of Fred Korematsu for violating that Order.
The now-unclassified documents, some of which I got declassified for my book, make it clear that there was no justification for that imprisonment, as does the action of the Commanding General on Hawaii who avoided the order to ship "his" Japanese-Americans to the mainland on grounds of lack of transportation.
(0% of the carpenters on Hawaii then were Japanese-Americans, and the General needed them to rebuild from the attack on Pearl Harbor, and to do the construction required for the war effort build-up there. And he was right. They were essential, able, and loyal workers.
Your assumption that the round-up had any real (as opposed to claimed at the time) connection with espionage is wrong. General deWitt actually submitted a report saying that the lack of espionage before the round-up was an indication that the Japanese-Americans were "well-organized" and were "holding off on their attacks."
You are perpetuating the kind of wrong and racist thinking that was prevalent then. You should read my book. It contains the photograph of a Lt. from the 442nd, the "Christmas Tree" Regiment that fought with great honor and many casualties in Italy, returning to Manzanar to visit his parents, who were being held behind garbed wire by other American soldiers. Think about that.
John / Billybob