There isn't a single war where the winners didn't do bad things to the losers. It's still hard to stomach the atrocities that the Japanese committed, especially since it hits closer to home, but I think if you examine history with a more critical eye, everyone's done it before - one way or another. That said, it doesn't mean they're less wrong - but well, sometimes the groups of people who comment on this aspect so happily need to take a firmer look at themselves.
Well, it is insignificant compared to the people who put war criminals and worshipped as heroes in the Yakusuni Shrine.