Thinking about this, and another argument worth considering - if the US gets out in the front with this, we control it. You might not love the morals behind it, but I'd prefer that we set the standard and we regulate the morals. If not us, some country like China or India, which have decent scientific infrastructure and a lot of out-of-work bioengineering Ph.Ds from US schools (whom we've kicked out of this country post-graduation, with tightened 9/11 security controls) could corner development in this space - who knows what kind of ghoulish program could emerge - these are the countries of population control and forced abortion.