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The leaders of National Socialist Workers Party (NSDAP) actually believed they are humanitarian (!) movement saving human race from degeneration. Those they murdered were subhumans. There was a whole layer of pseudo-scientific bullshit around it, today largely forgotten.
Marxists-Leninists at the same time had similar tribal fixation on equally vaguely defined "class" and competed with Nazis in number of purged "bourgeois".