Once we have this skill done pat, you can be assured that tampering with the genetic code to get the desired results will follow.First it will be to get rid of birth defects, or future heart trouble, or something like that. Then alcoholism and obesity and such. Then for the right eyes, hair color, chin, or IQ.
That's a separate topic, but an interesting one. Read this thread if you want my views on that topic.
I think that you hold human nature much higher than it really is... You must remember that we are descendants of Cain not Abel. Just look around you will see that we tend to flow to our lowest point in humanity. We are not intrinsically good; if we were we would all be living together and sharing everything.