No culture wants its past decision potrayed in a negative light. That said, the Chinese need to let up: learn from the past, don't wallow in it. On the other hand, the Japanese need to let up: learn from the past, don't ignore the facts for a happy reinterpretation.
Its like what get's taught in American high schools as "American History". Half of its wrong, and the other half is highly distorted propaganda. When people get to university and take proper history classes, they're all screwed up, because they've been taught fable and myth, not history. If they Japanese continue in that vein ("freeing Asian from... oppression" my ass: Nanjing and the Phillipines put the lie to that), they're going to end up as bad as us.