Sounds like an answer from a non-parent, honestly. There's a lot more to it than that, and virtually every couple I know with children thought about it a lot before going ahead.
The number one reason is because they see other families and the love and joy that their children bring into their lives. This is inspiring, and brings people around to making the decision, even if they know the sacrifices they will have to make.
Boiling it all down to pure biology is stripping parents of agency to fit your worldview.
Actually, this sounds like an answer from a male non-parent. There’s a drive to reproduce in every biological being. It has never been about comparing towards neighbors, love and joy, etc. I’m a parent, and honestly, it’s just biology.
So they have kids for their personal joy and completely ignore if their kids even have a chance of a good future, got it. I am sad when I see what kids will be confronted with in the long term. Humans nowadays already cant cope with climate change and wars, this will only be multiplied tenfold for our kids.
I don’t see a disagreement between you and parent comment.