Bye war crime denier. Hello probably worse war crime denier. I like know shit about Japan's politics other than their Communist party are soc dems (wouldn't be able to exist otherwise) and the largest non ruling Communist party in East Asia, and Liberal Democrats are shit but always remain in power.
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Right off the top of my head I'm guessing the Nanjing Massacre.
The issue is that he was also spineless so despite basically being a US vassal state he didn't want to antagonise China too much (in terms of substantial policies, not dumbass gestures like war crime shrine visits)
So if his successor is more competent at sucking Yankee cock it's worse news for Asia.