But the same people who refuse to see the difference between "civilizations that systematically conduct large-scale murder" and "civilizations that don't" will,

But the same people who refuse to see the difference between "civilizations that systematically conduct large-scale murder" and "civilizations that don't" will, if you disagree, call you a Nazi. But if the two are equivalent, then what's wrong with being a Nazi? Note well: I am not endorsing the Nazis. I am merely pointing out a bizarre aspect of cultural relativism and associated movements. Also note: They could make a case that the Spaniards were also in the "systematically conducting large-scale murder" category. But if that's the argument, then there's still a moral judgment to be made between civilizations.