Lord Sovereign
The resident Britbong
Hitler =/= Hirohito. The level of power Hirohito had in his government was not remotely comparable to Hitler. He was barely more than a figurehead.
Not to mention that, for Imperial Japan, mass murder was a means to an end and not the end goal in of itself. As vicious as they were, I don't think the Imperial Government ever considered a "final solution to the Korean/Chinese question." The driving force in Hitler's life was his maniacal obsession with "world Jewry" and destroying it.