I argued that this is a hand-wave — that Marquis is, in Belvedere’s words, “smuggling in personhood” — and I stand by that. If a fetus has the same moral value as a person for the same reason as a person, then the fetus is, morally, a person.
What’s the Moral Value of a Fetus?
Nicholas Grossman
164

If your conditional here is correct and if Marquis’s argument is sound, then, far from “smuggling” in the concept, he demonstrates that a fetus is, morally, a person.

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