As for it being a conspiracy (the aircraft carriers weren't there during the attack), I doubt it. FDR was more concerned with Great Britain falling than the Japanese Imperial Navy at that time...so intelligence resources were directed towards mitigating the Nazi threat (than the Japanese threat).
Remember, if Great Britain fell, the Atlantic would have been open to the Nazi's....and THAT would pose a MAJOR problem to the United States--given the bulk of our naval ships were in the Pacific Ocean.
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