There are millions of beautiful persons each of them with their own individuality. The combinations are endless. GE would only eliminate the ugly extremes but would not severely decrease the human diversity. It would normalize human traits but not dramatically decrease human diversity. And I don't think we need laws so select which traits to include.
Parents know, until proven contrary, what is best for their children.
Even if some crazy couple wanted a mutant, they can have one now by taking certain drugs during pregnancy. As an evolution for our species, this kind of treatment is also welcome because we will be able to evolve in ways not possible by natural means. Check out Homo sapiens sapiens cyber for more on this. Of course that one of the dangers is, for example, some parents refusing to make an abortion even after knowing that their child will be a mutant freak because of their religious beliefs. So I don't think that the government has the right to interfere in issues such as positive eugenics .