Historical revisionism isn't mere forgetting or denying historical facts. It seeks to reinterpret history in contemporary times. I don't think it's fair for anyone to say any historical episode shouldn't be revised. In fact, if we want Japanese history to accept these atrocities, we need revisions for these events to give them a place in Japanese history.
Nevertheless, it's a great reminder to how base humanity can get. Japan's WWII history has always been a hallmark of that.