In my readings, I have found that KGB agents within the Japan convinced those in charge to secure the oil in the Southeast as opposed to attacking Russia.
Japan's original plan was to assist the faltering Nazi war in Russia by opening a second front in the East. Much to Hitler's chagrin, they took the second option to secure the oil supplies, thus dragging the US into the war.
I wonder what would have happened if Japan had NOT attacked the US and instead had hit the Soviets from the East. The US would, most likely, have not joined the war, the Brits would have sued for peace....
I suggest reading “Day of Deceipt” before making judgements as to fault. Keep in mind, that by December 7, 1941, FDR was in his ninth year as President; unemployment was still 15% and the Great Depression would not end.
The lapses in security, the ultimatums and the moving of the Pacific Fleet to Hawaii all contributed to Pearl Harbor.