I have admitted that the Allies committed war crimes, so why aren't you satisfied? Why are you upset that I insist on pointing out that the Japanese did so as well?

If American war crimes are worth mentioning, then so are Japanese war crimes. Wanting to discuss one without the other isn't reasonable. What you are asking for is the erasure of context, and to that I say No.

Ego mostly, I guess its harder to be righteous and above others if you have some dark spot in your history. Also, some folks don't like complexity of real world so black and white is what they want, and obviously being on good side.