^
Ditto. True, it's hard to apologize for 3 years of horridities, or 30 some years of occupation - but that's not the point. Point is, in many things of the events of WWII, Japan has tried to systematically erase/deny/purge any acknowledgement or evidence of such happenings. Yes, it's time to heal, forgive and move on, but it's not going to help anyone by running from mistakes and the past. That's how history repeats itself.
With the rape of Nanking, or Korean Colonization, it's the same thing. The ire and rage such feel towards Japan can't be expected to be assuaged or appeased until Japan starts to step up to their mistakes and take responsibility for it. Germany did and so the world does not shun them for the most part. True, pockets of lingering risidual feelings exist, but it's not a collective as with China or SK for example.