The historical evidence is available. One article is the Japan Policy Research Institute Paper 92, June 2003, "Emperor Hirohito in 20th Century History: The Debate Rekindles" by SUNY Professor of History Herbert P. Bix.
One might (pathetically) argue that it was better the emperor not be justly tried and convicted of war crimes, but to deny the emperor didn't know or allow such war crimes to occur is completely delusional.
I didn't know this.
I could have accepted the idea that a group of sociopaths went off on their own and adopted "methods" that were "unsound"; you clearly know more about this topic than I do.