The discussion of Japanese war crimes does not need to be punctuated by mention of Allied war crimes, it feels more like a disingenuous "gotcha" than a legitimate concern for these atrocities. One side participated in the deliberate ethnic slaughter of anywhere from 10 to 25 million Chinese people, and the other did not. You cannot draw an equivalency between the Japanese military's conduct in the Sino-Japanese War and the atomic bombings of Hiroshima and Nagasaki, or the Holocaust and the fire-bombing of Dresden.
Nobody here will ever once deny that the Allies committed war crimes during World War Two, history is settled on that affair. It is wrong to draw an equivalence between these war crimes and the ones committed by the Axis, which more qualify as crimes against humanity.