Geneticists fear that one day this method could be used to create new races of humans with extra, desired characteristics such as strength or high intelligence.I realise, of course, that there are arguments why, paradoxically, that might be a scenario to fear. But "paradoxically" is an important word here. On the face of it, you'd think that it benefits children if they are given greater (potential for) strength and intelligence (in the sorts of environments in which their genes are likely to be expressed). Furthermore, on the face of it you might think that greater intelligence possessed by some people might be socially beneficial , or at least likely to be. So why word things as if it's just obvious that this would be a bad outcome?
I'll be exploring these sorts of things in my forthcoming book, Humanity Enhanced.