Thirty years after Pearl Harbor, men and women who lived through the actual war were confident enough in their ultimately victorious cause to show their side at the lowest ebb of defeat, prostrate after a humiliating surprise attack. Thirty years after that, people who'd only lived through Tora! Tora! Tora! thought it would play much better if they added another act and an extra hour to imagine what was really only a preemptive gesture as both historically apt and dramatically satisfying.
It's no wonder that, having been subject to another ambush, in the opening years of a war that will probably be fought for generations, so many people have either decided to either pretend it's not happening or preemptively prepare to surrender.
“Yesterday, December 7th, 1941 — a date which will live in infamy — the United States of America was suddenly and deliberately attacked by naval and air forces of the Empire of Japan.”