For Japanese leadership to realize war with the U.S. is a stupid idea, you have to give them
the ability to realize it's a stupid idea, & IJA & IJN seniors were, virtually to a man, incompetent to do so.
They lacked the ability to distinguish between tactical & strategic victory.


They lacked the wit to recognize victories against China & Russia did not mean they were able to win against the U.S. or Britain (never mind both


).
They lacked the ability to recognize war against China or Russia was severely constrained by geography, which a war with Britain or the U.S., let alone both,

was not going to be...
In short, they simply
did not have the understanding of the situation to realize it was (to borrow Morison's phrase) strategic imbecility.
Changing that requires a POD well before 1941, & I suggest, well before 1929, too. It requires a change in education & selection of senior officers in both services. It requires changes in training. It requires changing doctrine. And, in some measure, it may require changing Japan's experience: losing the war with Russia, instead of winning, frex.
If you've done that, you've not just butterflied the Pacific War, you've changed everything.


