Is there such a thing as good eugenics?

Some of the biggest supporters of human-embryo editing today are people who carry genes for serious disorders like beta thalassemia, the disease the Chinese scientists were working on. Jeff Carroll, a Western Washington University neuroscientist who inherited the mutation for Huntington’s disease — which can cause people to lose bodily control and slowly go mad, like his mother did — has been outspoken in favor. “I am saying, please, please do mess with our DNA,” he told the MIT Technology Review.