So in the past, people were sort of pushed into mariage and to have kids. And this went on for centuries actually. This caused that even if you didn’t want to have kids, you had some. Humanity drag those people’s genes even if they didn’t want to. But now, with more free world, we sort of get rid of those people, the only ones who copulate will be the people who want to. And in the next generation we can expect more people who want to copulate and so on and so on. Good
The ones who actually want kids are more likely to be good parents and pay attention to good education, in turn creating a productive member of society.
I guess that’s the theory, at least. Can’t generalize it of course, plenty of kids with absentee parent or coming from a loveless household who still managed to excel and “good” kids who ended up on the bottom rung, but statistically speaking, having an intact family is integral to success.
I don’t think the OP mentioned anything about breeding in general though. I’d rather see our planet depopulated rapidly, though that’s a hard sell. Most people actually seem to want kids, for some reason.