[QUOTE=BrainGlutton]
A more important question is, why are they off the radar in Japanese pop history?
[/QUOTE]
BrainGlutton, I’m going to tackle some of the reasons I see for this. Some caveats, first: I may be wrong, and I imagine that our Dopers from Japan will have a better handle on things than I do.
I think, first and foremost, is that it’s nearly impossible to overstate the effect of the reverence certain segments of the Japanese population have for the idea of a military aristocracy. As others have pointed out, the far right wing of the Japanese political spectrum have invested staggering amounts of political capital into what appears to many Westerners as nearly ancestor worship of all their famous military service members.
While the deniers that other posters have mentioned are infuriating, I think that the most illustrative act is/was the inclusion of Togo and several other executed war criminals into the Yasukuni Shrine.
Adding to the problem is that while this faction of the Japanese government is claimed (With justification, I believe.) to be not completely representative of the Japanese population’s attitudes as a whole, it has had a signifigant effect on the design and approval of texts for teaching history in the Japanese schools. Which then leaves many Japanese people without a specific interest in history with a somewhat skewed view of their own history.*
But that’s only some of the mechanisms for why war crime denial is such a strong aspect in Japanese culture. It doesn’t offer a real answer for why these groups feel so strongly about keeping their history ‘pure.’
I think that part of it is due to how Japan reacted to being opened to the west, going back to at least the Meiji era, and earlier. For a number of reasons the Japanese government and social institutions invested a lot of effort into fostering a self-reinforcing idea that Japanese people are special, and that their unique instutions are better than those of the rest of the world - even in the face of some daunting examples of foreign prowess.
Though I’ll admit that the cause and effects there could be argued to be the reverse, too.
*I’m well aware that most nations’ elementary education, especially in the US, is going to hit the high points only, leaving a lot of ambiguity on the cutting room floor, so to speak. I am of the opinion that the Japanese example sets a local ‘high water mark’ for this sort of behavior, but it’s far from unique to Japan.