All of the arguments in this thread seem to be treating this research's outcome as deleting a person, and applying a corresponding moral judgement thereto. But it is not! I personally find that choosing to not have a child with Down Syndrome by engineering away the possibility in advance is no worse than choosing not to have a child at all, and better than aborting a viable but affected fetus, because no life is ended. I am not a murderer for choosing not to have any child at all because I feel that my genes should not be imposed on another generation, and I am not a Nazi for saying that if I had a child, I would take any available humane steps to ensure it received the best subset of genetic material from the set available to it. I would, in fact, argue that leaving the creation of a whole person who will have to experience life for 80 years to a series of genetic coin flips is morally reprehensible. Just because we've always done it that way doesn't make it desirable or humane. I welcome this development.