Oh, giving ourselves endless lifespans is a fine endeavor. We've got plenty of ways to adapt to changing environments without changing our bodies, and we're pretty close to being able to do that without dying and evolving anyway. Shit might get weird, but it always does with us.

This is interesting because you propose that eugenics is inherently bad because it requires a lot of sacrifice, is that right? Because it doesn't have to. This line from Gattaca always stuck with me:

[Vincent's parents are planning a second child, and are shown four candidate embryos] Geneticist: We want to give your child the best possible start. Believe me, we have enough imperfection built in already. Your child doesn't need any more additional burdens. Keep in mind, this child is still you. Simply, the best, of you. You could conceive naturally a thousand times and never get such a result.

I could argue, could, that not doing eugenics on this level would be immoral. If we can use science to make people less prone to disease, to make them stronger and smarter, why wouldn't we? I'm not a fucking nazi here, I'm looking for a serious debate. We are already doing this in a different categorical scope with modern medicine. If we claim that all births must be "natural", then perhaps disease and death are also "natural" and we shouldn't intervene, and do without medical science and just have nature run its natural course.