Here you go - sound very close to some in today's anti-war movements. Same conspiracy ideas even.
I should have been a bit more specific and indicated that only some - or a few people had their heads in the sand, but that is the same as today as well.
This was, by the way, before Germany declared war, but after the attacks:
Elected with a small plurality, Jeannette Rankin arrived in Washington in January as one of six women in the House, two in the Senate. When, after the Japanese attack on Pearl Harbor, the U.S. Congress voted to declare war against Japan, Jeannette Rankin once again voted "no" to war. She also, once again, violated long tradition and spoke before her roll call vote, this time saying "As a woman I can't go to war, and I refuse to send anyone else" as she voted alone against the war resolution. She was denounced by the press and her colleagues, and barely escaped an angry mob. She believed that Roosevelt had deliberately provoked the attack on Pearl Harbor. See:
http://womenshistory.about.com/library/bio/blbio_jeannette_rankin.htm
DKK
She believed that Roosevelt had deliberately provoked the attack on Pearl Harbor.
By trying to isolate and shut down Japan's ability to get vital resources, a case could be made for that. More damningly, though...
Thomas Dewey (Republican candidate for President in 1944) tried to turn it into a campaign issue; he and several Republican senators claimed that "certain Japanese codes before Pearl Harbor" had been cracked, and that
FDR "knew what was happening before Pearl Harbor, and instead of being re-elected he ought to be impeached."