What you read and what really went on are two very different things.
* Most were openly and rabidly Anti-American
* Over 80% of those interned held dual citizenship.
* Most of these, at the opening of hostilities, applied for visas to return to Japan
* As this was an entirely new phenomenon, Congress had to enact regulations regarding issuance of visas during wartime.
On any reasonable understanding, none of these are true.
1. Certainly a few were "anti-American" (and a few were repatriated to Japan). All contemporary accounts , however, describe intense patriotism -- tens of thousands volunteered for service from the camps. And remember, 100,000 or more exactly comparable persons of japanese ancestry lived unmolested on Hawaii all during the war, without any visible, let alone "open and rabid" anti-americanism.
2. Way over 20% were native-born american citizens. If Japan called them "dual citizens" (and I don't know of the evidence for this -- you may be right) that's not their fault. Any American citizen has to renounce allegiance to any other country -- what the other country does is not under their control.
3. No evidence at all that "most" of "80%" of all internees applied to return to Japan. My guess is that you are misreporting, at best, "most" of some very small subset of Japanese citizens in the US.
4. Regulation of visas in wartime is certainly not a new phenomenon. See WW I.
Not everything in Malkin's book is Loony, but the 4 points you have picked out here are.
Organized crime was once a big problem and mostly Sicilians. Why the hell did we not intern the Sicilians.
Wow! Where did you get this strange data? I never read anything like it in the dozens of books I have read about the affair. The latest book is "The New Dealer's War'" in which the forced removal of the Japanese from California was the result of racist hostility and jealousy. Even J. Edgar Hoover was opposed to the incarceration of the Japanese/American citizens. FDR forced the issue, however and it was done.
My uncle was a camp commander and he never once mentioned any anti-Americans in the camps. Quite the contrary, he came to admire them and they liked him. There were camps here in Utah and they flew the flag and celebrated the 4th of July as fervently as anyone else. There were even more Japanese in Hawaii, but they were not removed. Futhermore, how come so many young Japanese in the camps joined the army and fought extremely well, winning more medals per unit than any other in WW II?