Designer babies are in the news again. The LA Fertility Institutes, headed by a 1970s IVF pioneer, have offered the opportunity for potential parents to choose traits such as the eye and hair colour of their children: http://news.bbc.co.uk/1/hi/health/7918296.stm
Unsurprisingly, slippery slope arguments have already begun to appear: http://www.theage.com.au/world/la-delivers-first-designerbaby-clinic-20090302-8meq.html Marcy Darnovsky, director of the Centre for Genetics and Society, has said: ‘The concern is that we'll be creating a society with new sorts of discrimination. Now it’s eye and hair colour. What happens if it’s height and intelligence?’
Slopes can be slippery in different ways, and they can be more or less slippery. The strongest form of slippery slope argument points to a logical implication: if you accept A (which you seem to think is good), then you must accept B (which presumably you think is bad). Pretty clearly, we don’t have an argument of that kind in the present case. There’s no logical inconsistency in being in favour of parents’ being allowed to select certain traits of their children, while being against discrimination. Nor of course is the existence of selection itself inconsistent with the absence of discrimination.
A more common form of the argument appeals to the lack of a non-arbitrary stopping point. The idea is that you should not accept A because A might conceivably lead to B, and you could find no non-arbitrary place to draw the line between A and B. That doesn’t seem to be Darnovsky’s argument, however, since it wouldn’t be arbitrary to stop selection if it were clearly leading to discrimination, but to permit it up to that point.
The argument here is essentially an appeal to consequences. As stated, however, it is clearly too strong. The concern cannot plausibly that we will be creating a society with new forms of discrimination. Rather, the idea must be that trait-selection may lead to these new forms of discrimination. So we can imagine a world in which people whose parents haven’t selected for certain eye or hair colours are discriminated against, which we can certainly accept would be undesirable.
The main issue here is how likely it is that discrimination on grounds of eye or hair colour will arise. On the face of it, it looks rather unlikely. People’s tastes in eye and hair colour vary a lot, so not everyone would go for (say) blue-eyed and blond children. And these kinds of characteristics anyway do not at present seem to be the basis for any systematic discrimination.
But, the argument suggests, selection for eye and hair colour may lead to selection for height and intelligence, and these may provide the basis for new kinds of discrimination. Again, however, it’s not clear why trait-selection even of these characteristics would lead to new forms of discrimination. There may be discrimination against short people now, in which case trait-selection wouldn’t be creating anything new. And if there isn’t any, then it’s not clear why it should be created merely through there being more tall people around.
Appeals to slippery slopes often rely on the idea that things could get out of control. Once you’re on that slope, you’re just going to keep slipping down and there’s nothing you can do. But that doesn’t seem to be the case with trait-selection. If it does turn out to have consequences we’d prefer to avoid, then we can stop doing it. Fertility clinics do not operate in a legislative vacuum.
So there’s no strong argument here for preventing those few parents who want to choose the eye or hair colour of their children to get on with it. Even if there is a slope, it is not especially slippery -- we can get off at any time.
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