I once saw a book on the subject of Japanese loyalty. I read the dust cover and now I wish I had bought it but it clearly stated that there was a large number of Japanese Americans particularly in Hawaii who supported the Japanese totally in WWII.
It mentioned one event which I only recall was of a Japanese pilot who landed on one of the more remote islands and who the locals hid from America.
The incident at Niihau Island immediately following the attack on Pearl Harbor was instrumental in leading to the decision to start internment.
Two Zero pilots were shot down in the Pearl Harbor fight. Only one survived, crash landing on the outermost Island of Niihau. At that time Niihau was inhabited largely by native Hawaiians and American Citizens of Japanese descent.
The pilot was able to recruit a Japanese American citizen couple to work with him to round up his neighbors by gun point, at one point trying retrieve the machine guns from his downed plane.
His neighbors were shocked. The couple, the Haradas had lived in Hawaii their whole lives and were American Citizens. Yet when a Japanese Zero pilot drops from the sky they then round up their neighbors by gunpoint.
The story is much longer and some accounts can be found here.
Incident on Niihau Island - Jason Bellows
The Niihau Incident - HistoryNet.com
The islanders were isolated and completely under the control of the Japanese. They were readying the plane's machine guns on a cart. The islanders feared the worst..
The incident ends when a huge brave Hawaiian rushed the pilot taking three bullets and lifting the pilot high overhead and dashing him on a rock wall. His equally brave wife finished off the pilot by stoving in his skull with a rock.
This betrayal by life long neighbors was so unexpected it changed America's view of Japanese American Citizens.
It is very easy to be smug and self righteous about what we think should have been done. World War 2 was a hard, hard fight and we almost didn't win it.
There is very little information on Niihau and I believe such a crucial event has been hidden in order to condemn America unfairly. We see through a glass darkly and not all is apparent from our vantage point.