When any group is being sufficiently totalitarian in the name of lofty ideals, I support comparisons to other totalitarian groups, which may include the Nazis and the Soviets (among others). I believe that such comparisons can help us learn from history. Of course, the subject of such comparisons will always be both quantitatively and qualitatively different, but the Nazis and the Soviets provide intersubjective references points for certain political ideas gone wrong.

Of course, it could be more rhetorically pragmatic to swallow these analogies even when accurate depending on the audience.