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I always wondered why Japanese men are such girly little weaklings now compared to the marauders they were in WW2, but then someone posited an interesting theory.
Basically, the Japanese military was completely decimated. Honor was such a big thing, that they refused to surrender and preferred dying needlessly in huge droves. The marines were just killing teenage boys at the end because everyone else was dead.
So all the real men in Japan were gone, and gone with them their aggressive genes and cultural attitudes, leaving only the weaklings to continue breeding, and the women to form the basic culture the little boys grew up in right afterward.