Good Lord, Jason, give it a rest. Seriously. The conduct of Imperial Japanese soldiers is indefensible. Japan gave it a try at conquering an empire, and lost in the process. If you see Bushido code as a desirable ethic still, at least acknowledge that it was abused and let astray just like the Nazis abused and tainted patriotism.
Maybe to Japan at the time the rest of the world appeared so alien as Japan still appears to the world today that they didn't understand how their conduct would be perceived. The world would have turned the other eye to Japanese conquest, probably even the Dutch and other colonies at the time, or at least the European nations were in no shape to actually do something about it. But then Japan decided to go all in and attack Pearl Harbor in the attempt to gain the upper hand in the peace negotiations because they mistakenly thought that America was weak.
Miscalculation. And there is nobody to blame for it but Japan.
It's permissible to look at it as a tragedy of cultural mismatch if you want. But Japan wasn't content with peaceful development. It wanted to conquer, and received a conqueror's fate in the age of industrialized warfare because they had to kick the sleeping giant into the ballsack. That the US chose to defeat Japan in the least costly way by demonstrating technological superiority may still be a thorn in Japanese collective memory, but I can't blame the US for it. Japan still impostered will and capability for prolonged warfare - another miscalculation, when giving the mission orders for Okinawa - so the US president chose the option that offered the greatest chance of success without the expense in blood and treasure to bring the war to an end.