If you think Japan didn't war crimes during WWII then boy do I have some clearly documented evidence for you.

Nobody ever thought the Rape of Nanking was normal or acceptable at the time.

Yea, Warcrimes. The only ones they did where considered NORMAL at that time, wich is force prostitution of woman. Killing Chinese with all means? No war crime here, as harsh as it sounds, thats WAREFARE for you. BTW. China started the second big war themselfe, Japan Retaliated and beat them. Shure in the end Japan lost, thats why EVERYONE seems to be on the chinese side. Imagine Japan won WW2 in the pacific. Would you DARE to even SAY there where crimes? I dont think so. US did much worse than Japan in total, and they where among the ones doing nearly none. If you talk Warcrimes, then Talk about Russia, they REINVENTED Warcrimes right after Germany did invent them.

So you basically just ended the conversation after talking about the complexity of ww1 alliances?