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Therefore, Pragmatism is the best course of action.
That means we take some good ideas from Dr. Singer and we do the best we can. And we don't lord our choices over our fellow humans, because this is not some kind of contest.
P.S.--But when our ethics get us to the place where we think we can justify beastiality, it is time to get us a new set of ethics. Because that right there is just fucked up.