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Try telling that to the face of someone whose whole family died in the death marches.
My argument is genocide is bad, ethnic cleansing is bad, and that there is no meaningful difference between the two.
Your argument is genocide is bad, ethnic cleansing is frowned but somehow less bad, and that there is a meaning distinction between ethnic cleansing and genocide that your argument does not articulate.
Genocide denial is still genocide denial even if your argument uses victims of one genocide to deny that genocide happened to other groups of people.