On Xitter, Bryan Bishop argues in favor of cloning as more ethical than natural reproduction.

And he clarifies that intentionally bringing disabled children into this world is the unethical thing that could be stopped by cloning:

If we took that approach, we would ultimately pick known genomes over mutations or new combinations of genes. We would sort of agree on a set of valid templates from as of today 8 billion candidates. We would stop evolution and we would reduce the gene pool even if humans were to grow drastically in number. I took interstellar expansion as a scenario where we most certainly would grow beyond 8 billion specimen.

My understanding was that favoring the ethical thing would happen naturally and not through force. I'm slightly confused by his answer to my comment.

Parents have the right to do what they want about their reproduction. In my opinion, they have the right to have kids - as many as they want - even though some see babies as merely drivers of climate change. They have the right to not have kids even though some see it as a divine duty to have kids. They have the right to pick genes in vitro or even tweak genes to boost the IQ or whatever if they think that's what's best for them and their kids.

But I think 8 billion different genomes is way better than lets say 8 million if we ever hit some zombie apocalypse. The mutation we see as worthy of extinction or unethical of bringing into the next generation might be precisely what provides some immunity against the next nasty bug.

To clone what worked the last generation is to bet on continuity. If ever something fundamentally changes, we want diversity to hopefully have some specimen that can adapt to the change. But I'm most certainly not in favor of mandating who should have the most divergent kids and I guess we will see a trend of convergence towards some genes and away from others and cloning might be one way of achieving this but I doubt it will play a big role in human reproduction as it's too beautiful a thing to have two unique human beings watch what comes from each side of their particular parenthood.