You should check out the history of eugenics, it sounds like you'd be interested in those concepts. Do keep in mind that almost everyone is offended by them, however.
Eugenics has two strands (negative and positive). Many people are offended by the negative (stopping the "undesirable" from having children), but I haven't met too many people who are offended by the "desirable" choosing to have more children.
It's not tangential to me, and yes, I'm totally offended by both strands. I used to date the author of the "Darwin Awards" website and books, and I've spent a lot of time interacting with the general public about these concepts.
This is all tangential to my post.