[SampleMan]

And you could forget about Patton as well.

Bull Halsey, "When I'm done the only place that Japanese will be spoken is Hell."

[Oldexpat]

While the incarceration of thousands of Japanese American’s was a violation of their civil rights..evidence exists that overseas Japanese did in fact aid the Japanese war machine with information in Malaysia and elsewhere when the Japanese invaded. We simply could not figure out who might have been a spy.
We have a similiar problem today with the Chinese and some other immigrant groups. It is impossible to know who is giving away our secrets.