Aristotle’s mistake was serious enough that he comes off badly even when compared to the various “bad guys” of history who sought to justify the exclusion of certain groups — women, Black people, Jews, gays, atheists — from the sheltering umbrella of human dignity. Because Aristotle went so far as to think there was no umbrella.
Yet I would defend Aristotle, and his place on philosophy syllabuses, by pointing to the benefits of engaging with him. He can help us identify the grounds of our own egalitarian commitments; and his ethical system may capture truths — for instance, about the importance of aiming for extraordinary excellence — that we have yet to incorporate into our own.
And I want to go a step further, and make an even stronger claim on behalf of Aristotle. It is not only that the benefits of reading Aristotle counteract the costs, but that there are no costs. In fact we have no reason at all to cancel Aristotle. Aristotle is simply not our enemy.