The OP was just saying that most of the non-ineffable things about love are natural selection, and that what the eugenicists wanted was already happening naturally. Nature is cruel after all.
"actively practices" is the polar opposite of natural selection.
To wit: "Charles Darwin popularised the term "natural selection", contrasting it with artificial selection, which in his view is intentional, whereas natural selection is not."[1]
To wit: "Charles Darwin popularised the term "natural selection", contrasting it with artificial selection, which in his view is intentional, whereas natural selection is not."[1]
[1]https://en.wikipedia.org/wiki/Natural_selection