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If you're going to say "if humans have value then animals have value too", you are essentially saying "the same reasons that humans have value also apply to other animals". Since we don't know the reasons humans have value, this argument can't be evaluated.

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Even if we don't know why humans have value, but we do know that humans have value and that the reason is none of the characteristics that humans have but other animals lack, logically follows that others have value too.

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How could we possibly "know humans have value" and "not know the reason why" yet "know the reasoning would also apply to other animals"?