[humanrebar]

So, barring metaphysical axioms about the intrinsic worth of humanity, we measure worth by utility?

The utility answer resolves some of the tension, but it doesn't address what happens when an animal might have more utility than a human. What about protecting endangered rhinos versus viable fetuses with severe but nonterminal developmental issues?

Not really a rhetorical question, by the way, the Down's Syndrome population is way down and not because we cured Down's Syndrome.