This film produced shortly after the attack on Pearl Harbor probably reflects the bellicose, revengeful attitude of most Americans after Imperial Japan’s surprise attack.
REMEMBER PEARL HARBOR! – The powerful emotion evoked served to unite many Americans who had been previously divided over any participation in another global war.
It is likely that the Japanese underestimated this potential response when they planned a strike to cripple the American Pacific fleet and hoped that the USA would agree to a peace proposal that allowed them to keep their newly-acquired territories.
Interesting piece debunking Pearl Harbor myths in America in WWII Magazine
http://www.americainwwii.com/articles/debunking-top-pearl-harbor-myths/