While hardly a true secret, it's always important to remember the "other" genocidal unit, 731. The Germans at least have done everything anyone could think of to gain redemption for their crimes. Only the current generation of adults, the first to be able to legitimately claim they had absolutely no part in any of it, are attempting to point out that Germans suffered too. The Japanese, well, one of the best ways to shock a Japanese person is to have them look up Unit 731 on the English Wikipedia. The smart Westerner, the one who doesn't want his Tokyo apartment firebombed, will do nothing more than that.

There's a reason the rest of Asia hates Japan, and it has nothing to do with their current success.