I think that's different. The Chinese were invaded and violently occupied by the Japanese, that would be more like Jews (or Poles) speaking of Germans as Murder

I think that's different. The Chinese were invaded and violently occupied by the Japanese, that would be more like Jews (or Poles) speaking of Germans as Murderers. The supremacist angle is the German concept of "Untermensch" (sub-human) in comparison to the "Übermensch". I believe the Japanese had similar notions, but I don't think they're prevalent (and certainly not voiced) now.