Eugenics is not just an issue for the Chinese, of course. People value intelligence in mates in part because they want smart children. I'm not sure why directly selecting for valued traits is worse than indirectly doing so though the choice of a mate.

Engineering the Perfect Baby
MIT Technology Review
By Antonio Regalado
March 5, 2015
Quote
The objective of these groups is to demonstrate that it’s possible to produce children free of specific genes that cause inherited disease. If it’s possible to correct the DNA in a woman’s egg, or a man’s sperm, those cells could be used in an in vitro fertilization (IVF) clinic to produce an embryo and then a child. It might also be possible to directly edit the DNA of an early-stage IVF embryo using CRISPR. Several people interviewed by MIT Technology Review said that such experiments had already been carried out in China and that results describing edited embryos were pending publication. These people didn’t wish to comment publicly because the papers are under review.

All this means that germ-line engineering is much farther along than anyone imagined. “What you are talking about is a major issue for all humanity,” says Merle Berger, one of the founders of Boston IVF, a network of fertility clinics that is among the largest in the world and helps more than a thousand women get pregnant each year. “It would be the biggest thing that ever happened in our field,” he says. Berger predicts that repairing genes for serious inherited disease will win wide public acceptance, but beyond that, the technology would cause a public uproar because “everyone would want the perfect child” and it could lead to picking and choosing eye color and eventually intelligence. “These are things we talk about all the time,” he says. “But we have never had the opportunity to do it.”