WW2 is all atrocity. There was nothing noble about it. All sides pretended they were fighting to "save the world". The japanese claimed they were fighting to liberate asia from european colonizers. The germans claimed they were trying to save the world from soviets/etc. We claimed we were trying the world. It's all nonsense. Everyone was fighting over wealth and money.
Had the japanese won ww2, they would have framed it like they were trying to liberate australia from genocidal europen invaders oppressing the aborigines all the while raping the land for resources. Similar to what the british did to australia when they conquered it. Just like we pretend we "liberated" the philippines from the japanese when in actuality, we had invaded and colonized the philippines for 50 years before the japanese decided to play empire.
The point of ww2 should be that everyone is capable of and has committed evil and we shouldn't have another war like that. But of course the winning side gets to write the history and naturally, the winning side twists history to for their benefit. In japan's case, even the losing side twists it to their benefit.
As sherman said, "War is hell". There aren't any saints in hell.