Lol, Have you never read anything about the post-Mongolian conquest Chinese at all? They were possibly the most barbaric group of people in history, and that's mainly why Imperial Japan didn't show them any quarter during WW2. During the first failed Mongolian invasion of Honshu, the Mongolian troops took dead raped children they'd taken from the small islands around Japan, mostly from Tsushima, and then tied them to their ship's masts in order to terrorize the Japanese defenders. The fact that Imperial Japan didn't just entirely wipe out all of the Chinese was a mercy they probably didn't deserve.
As for Oskar Dirlewanger, yeah no shit he was a horrible person. That's why the Third Reich shoved him out on the ass end of the eastern front where he'd mostly only be killing people of his same caliber. Western-allied prisoners were mostly treated well by the Third Reich, and unlike the JewSA who carpet-bombed enemy or enemy-occupied cities, the Germans mostly left any populated areas intact if at all possible.