Hiroshima still was a war crime.
Imperial Japan committed numerous war crimes, whether or not they agreed that they were war crimes at the time. By the same token anything that was done to them should not be judged by what their own standard was.
Acknowledgement that it was a warcrime.
> by which standard that Imperial Japan recognized and adhered to?
Admonishment to get some damn perspective. What was done to Japan must be evaluated in the context of what Japan would have been doing to American soldiers and POWs had America been forced to invaded Japan proper. That war was non-stop war crimes from Japan. Particularly perfidy, false surrender, which would have gotten huge numbers of Japanese civilians killed in any case. Truman made the right call, for America and for Japan.
Why can't we admit that the Allies committed their own war crimes and move on?
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.
Hiroshima still was a war crime.