Right, sure, every evil overlord needs a group of willing henchmen and an army of reluctant-to-object enablers. So, the original quote is probably right "in aggregate", though not in the amount of evil per person. Even then, how do you attribute/distribute the amount of evil between, say, Pol Pot ordering the destruction of intelligentsia and the genocide of the Chinese minority and a peasant working his rice field in the countryside, occasionally affirming his allegiance to the regime, as required? Hmm, I recall HPMoR!Quirrell talking about it, but I'm not sure how much of it is author tract.