Cool
Thunder, pretty good summary. I can answer a little about the why only China is protesting. Well, it not just China protesting, but also include SK and NK.
Many otehr nations or even SK are not drummed up with the anguish because of Japan's economic influences. SK, wary of PRC, does not really want to upset Japan too dramatically because the alliance pack and influence of the US policy of containing PRC.
Taiwan, well, it wants Japan as its ally for the Independence cause, so it can set aside the past history and much angers. I don't know how much WWII and Japan's occupation history it teaches in school. I don't know if the general publics know what Sick Men of Asia truely means.
Another note to consider, Japan percieve all Asians were weaklings and subhuman. I don not beleive Japan would treat TW people as equal in the war enventough they built school, roads, and houses. Japanese language was the primary language taught in school instead of Taiwanese and Mandarin during the occupation. History was taught in a way that any Chinese heritage would be considered non-conformed to Japan's vision during the occupation. Would you consider this as culture genocide? The silence of Taiwan is a bit too weak. To me, TW is kind of avioiding the truth and confrontation for other political favorite (independence). It seems like TW is trying to forget they were once subhuman and weaklings of Asia in the eye of Japanese, yet fail to see they are still percieved as is by the Japanese refusal of the past and rewritting of history. The need of support takes precedence over integrity and justice.
Other Asian countries affected by Japanese, well, some poor countries need the financial help and kept the anguish down to the minimum level. I don't know how Singapore and Malaysia percieve in this matter. Personally, I can forgive Japan if (1) Japan act responsiblly like Germany does regards to history teaching. (2) Japan apologize (as a Nation, not just a single politician) for its atrocities commited to all affected Asian countries, Aussies, comfort women and PoWs (NOT JUST AMERICANS and Pearl Harbor event).
Regards to exposure of Internation information, yes you are right that Japan is an information-open society. However, the Asian pride and inflexible educational system creates youths that will not accept Japan was the aggressor instead, an victim of WWII. You have information out there yet the system as awhole refuse to process and understand it. This alone makes the information system near useless.