There is too much circumstantial evidence against FDR to believe he didn’t know what was coming.
Just a few facts:
1. FDR demanded the US Navy Pacific fleet be moved to Pearl Harbor. When the commander of the Pacific Fleet said no, FDR fired him and got a flunky in to get it done. It was clear the fleet couldn’t be protected at Pearl Harbor.
2. The carriers were moved out just prior to the attack, to deliver planes to Midway Island and Wake Island. Leaving behind mostly antiquated WWI battleships of little consequence.
3. “Vacant Sea” orders issued by four star admiral Ingersoll which cleared the ocean of shipping for the Japanese fleet to descend on Pearl. The good admiral also directed Kimmel to stop ship patrols into the area where the Japanese fleet approached.
4. The Japanese military communication codes were broken by the US PRIOR to the attack on Pearl Harbor. The US knew all along were the Japanese fleet was and what it’s intended target was.
5. FDR placed extreme harsh economic sanctions on Japan prior to the attack. Essentially depriving Japan of oil. Thus forcing their hand.
6. FDR’s favorite battleship the Indianapolis receives orders to ship out immediately. It leaves Pearl with half its crew ashore on leave, just prior to Japan’s attack.
7. Discussions were made by FDR and top administration officials to position Japan to attack. They knew Japan had a history of surprise attacks.
8. FDR desperately wanted war to help the UK and USSR. War is the health of the state…FDR loves a healthy state.
Who benefits?
FDR had been desperately trying to get Germany to sink US shipping, without success. Trying Wilson’s playbook…remember the Lusitania. He was actively supplying the UK with all sorts of armaments, without informing Congress. He told the American people repeatedly in the 1940 campaign their boys weren’t going to war. Of course that was a lie. The country was adamant about not getting into another terrible war.