OK man, I'm pretty sure you're just being a textbook generalist and a comfort zone idealist instead of a thinker and a realist. Let me explain. First of all, evolution doesn't work the way most people think. When some people think of "survival of the fittest", they think of some guy going to gym, getting ripped and learning tai-kwon-do, when in reality, two normal, sensible dudes could take that one try hard in a fight. Our greatest strength as humans is our sense of community which we get through our developed sense of empathy - very important. I understand not wanting to breed deformities and disease, but those are few and far between, not mention very unpredictable. That argument does not hold water.
Not only does evolution not work like most people think, but natural selection doesn't work like you think. This new sense of community and including everybody, weaknesses and all, IS our modern form of NS. Denying this leads to what you and I talked about earlier, people who think they are better than others, oppressing them, teaching their kids the same thing, so on and so forth, leading to the shit show we have today, and holding us back as a species in general.