I don't buy the conspiracy crap. In order for a conspiracy to make sense, Roosevelt would have had to know ahead of time that the attack would cause the American people to rally behind the war effort, rather than become demoralized and defeatist. This was by no means assured.
He also would have had to know ahead of time that we would (almost miraculously) win the Battle of Midway. If we had lost at Midway, the Japanese would have been free to invade the West Coast.
You might want to give Oscar Meyer a call about purchasing that tonnage of bologna.