God no. I can’t imagine a more horrific punishment than to be childless.

I wish we had more than the two we have, but my wife and I started late. My daughter (12) sometimes asks how many children she could realistically have… a good sign that she hasn’t been tainted by whatever mental illness it is that the “childfree” people have.

I have no idea what “greatest” means. It’s a superlative word, but implies no meaningful measurement that can be tested and verified.

Also the word “believe” is problematic. “think” might be better. Or “hold the opinion”.

Both of these points support the idea that you’re asking about an emotional state, rather than a intellectual position. Basically you’re asking “why do people like the place that they live and mindlessly cheer for it when sociologically appropriate moments for such displays become available”. That’s a question that answers itself, is it not?