William Saletan writes in Slate on our trip "down the slippery slope toward eugenics." According to Saletan, the pathway comprises various refinements in prenatal screening that allow parents finer discrimination over the characteristics of the child they will bring to term.
Setting aside concerns of social justice (which are far too broad legitimately to cabin off liberal eugenics alone as objectionable--you'd have to include tutoring, violin lessons and vacations to Europe), I don't think I understand the problem. These technologies are being made available to parents, for their disposal. No one (so far as I can tell) has succesfully argued that the "slippery slope" involved leads to state coercion. And, as I understand it, the goal of totalizing the eugenic "imperative" was (and is) the main ethical and political objection to the eugenics movements of the 19th and early 20th centuries.
Maybe it's the only objection. The "eugenics" we're talking about here is arguably just a logical extension of the mate-choice strategies animals use to increase the likelihood that their offspring will enjoy high fitness. In "nature," animals (including human animals) are forced to base their assessment on the observable traits of their potential mates (intelligence, social status, symmetry [and other aspects of physical "beauty"], physical robustness, etc.) as a proxy. The new technologies simply give us more direct information so that we don't have to rely exclusively on the secondary, phenotypic traits of our potential mates as proxies for the expected fitness of offspring.
And even without such technologies, we now take all sorts of measures to increase the likelihood that our offspring will be genetically healthy. For example, we recommend (strongly!) that pregnant mothers avoid smoking, drinking, or going for a swim in pools of mercury (probably a bad idea for nonpregnant mothers as well). These are all "eugenic" strategies--at least in the sense that they are geared against introducing genetic mutations or distorting gene expression. Are they for that reason objectionable?
If there is anything to object to, it would seem to be the yuppie-weighted valuations given to traits like "intelligence" over arguably more enlightened traits like, say, emotional health, or even wisdom. These less quantifiable traits are impracticable to screen for, and perhaps have an insignificant genetic basis. But assuming I were in a position to chose to bring into the world the one out of hundreds (or thousands, or millions) of my potential children having the greatest likelihood to grow up physically, emotionally and intellectually healthy, wouldn't it be a dereliction of my parental duty to abjure the choice?
Side note: I've completely set aside the issue of the valuation of the lives of the embryos discarded after "deselection," and so obviously nothing I wrote above will be persuasive to pro-lifers. (Hopefully it's persuasive to someone else.) For what it's worth, my view is that undeveloped human embryos are not moral patients. Although choosing where to draw the moral line on this question is tricky, I believe one- or two-week old blastocysts (of the sort I believe are in issue in the screening Saletan is writing about) fall far short of where any reasonable line could be drawn.
UPDATE: Eugene (no etymological relation to 'eugenics,' as far as I know) Volokh has a post on the topic.
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