For additional discussion: I don't think all life is sacred. I just don't think humans are good at deciding how to draw that line, nor do I think that doing so would be helpful, as shown above. Not to be confused with the idea that humans are sacred either - in fact I think we should do a far better job controlling our population and managing our waste so as to stop the genocide of every other lifeform on the planet (as it'll lead to our own downfall, but whatever, that's perhaps another issue).
What I wanted to get to was, rather than killing off people who don't look the way we want them too, I'm much more for the manipulation of genetics to create humans that are 'better'. Rather than letting sloppy evolution drive us into the idiot corner, I think we need to take control of it. Stop letting people decide how many babies they make, and who they make them with.
Much better, though the outcome risks being similar to the above, to let let people augment their offspring as they choose. Better still to limit the number of new humans each human gets to make at the same time.
I just don't believe in high-holy-evolutionary-dice-rolling. IMO, better to take a more direct approach, even if it takes a few centuries of botched jobs to get the hang of it.