And that taboo is probably rooted in evolutionary psychology, people have a genetically driven tendency to criticize those who advocate having less children? So could there be an instinctual drive behind it?
https://www.flashpack.com/solo/relationships/dont-want-kids-...
Treat it as a software optimisation problem - should you go after a large number of very minro problems, or take an axe to the single large problem that dominates your metrics?
https://www.theguardian.com/environment/2023/nov/20/richest-...
This is congruent with removing women's bodily autonomy, banning abortion and banning or restricting birth control of all types.
When you get to the far right wing, it's not just about "are there sufficient numbers of children?" but "Is my favoured population subgroup having sufficient numbers of children?"
i.e. racism