Oh, so it WAS you, @minismallholding, in whose post I saw the graph you shared in a comment to my post. I remember reading Roberts' article via your link, which incidentally some other friend of mine shared on another social media site. Thanks for the inspiration.
By the way, I also agree with what you said about genetic disorders... Though I consider that a completely different subject, I think it overlaps in the sense that we don't want our children to suffer from something we know we cannot prevent.