For me, it's the racial element of the Holocaust that marks it out from the red terrors of the twentieth century. Genocide is the killing of a population group defined in terms of nationality, religion or ethnicity. Most of the red terrors (Stalin, Mao, Pol Pot) did not target such groups per se (perhaps Stalin's repression of Ukraine excepted). They targeted opponents (real or imagined) or social classes. Compared to other genocides proper, the Holocaust was just writ much larger and done with terrible efficiency by one of the supposedly most cultured and advanced nations on earth.
I'm not saying it is worse to target a group defined in terms of ethnicity than one defined in terms of social class or political affiliation. However, it is different. The Holocaust stands out because it is a clear example of the poisonous nature of racism. The lessons of Stalin or Mao are different and perhaps less simple (that revolutions devour their own children; that absolute power corrupts absolutely etc).
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