Greasley's thought here is straightforward: if people would save one infant over five embryos, then they simply cannot believe that those embryos are "morally considerable persons." Of course, even if this is what the respondents believe, that doesn't by itself show that the belief is true. To be fair, Greasley does somewhat concede this point, noting that historically many have (falsely) denied the moral status of certain groups. Nonetheless, she largely dismisses the possibility that this is just a mistaken belief and seems to think the only truly plausible explanation for the near universal intuition is a (warranted) belief that the infant is a person and the embryos are not.
I do not have much confidence in the philosophical helpfulness of these sorts of cases in general, but if we are forced to play this game some reflection will show that the [embryo rescue case] doesn't have nearly the force Greasley want to gives it. Consider a parallel case in which we have to choose between saving five fully conscious nonagenarians and one baby. Perhaps I am unusual, but my intuitions are almost entirely in favor of the baby, "even though this would mean saving the one over the many." This is obviously not because I think the elderly are not persons. In fact, forced to choose, I wouldn't hesitate much between saving, say, one mother with small children over five childless, middle-aged tenured philosophy professors. Again, this is not because I deny the personhood of my colleagues (certain faculty meetings notwithstanding), but for the simple reason that I genuinely believe that it would very likely be worse for several small children to lose their mother than for five childless adults to die tragically (though, of course, there are possible circumstances that might cause me to reconsider). In short, a decided preference for one over many does not by itself entail, or even strongly suggest, a clear denial of the personhood of the many.
UPDATE: I'm opening comments, since I've heard from some readers who wanted to contest the reviewer's argument (if not the humor of the second paragraph). Signed comments will be strongly preferred here.




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