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-...
In fact, nowadays I'm beginning to hear the opposite: "please have more kids". I'm in Europe atm (I'm south-american) and I'm shocked to see that natives, by and large, just do NOT have kids, or at most 1. All cultural incentives that promoted having kids seem to have been vilified. I find it kind of sad honestly...