Japan pissed off the US ---> Hiroshima and Nagasaki
Islamics piss us off (one can hope for) ----> same results on Mecca / Medina
His warning to his superiors was that the United States was a very strange country. The people were very amiable and kind of dull-witted for the most part, and Japan would probably be able to score a decisive victory over the U.S. in any naval engagements in the Pacific over the short term.
"But when awakened from its slumber," he said (and I'm paraphrasing), "the United States will unleash a hellish fury on us that will make us rue the day we were ever born."