For me personally, I’m also child-free and I’ve lived in 7 different countries now working in tech, saving lots of money, living in various tax free locales etc.
I can't think of one compelling reason to have a child. All the reasons parent friends list off are so unappealing or selfish in their own way, I have to try and not laugh at the irony and lack of self-awareness.
Even if you're (very) rich and saved for it, the fact that less and less young people are available to create wealth means that the economy becomes inflationary, or has to use immigrants, depleting the other poor countries of their skilled workforce.
Unfortunately, a volontary "child-free" or rather childless, it's not a disease, thanks, is a kind of freeloading. Politically it's very destructive, as people without children don't want to fund infrastructure or services for them, aggravating the problem.
If you want an example, Italy is a great example of a dying society due to the lack of reproduction and the State' disinterest for it.
Who's going to take care of you when you'll be old, either physically or financially? Someone else's kid. Please let me know how this is wrong.
As for Italy, there's almost no childcare, no financial help for parents, no infrastructure for families. Pediatrics are quite expensive, and here people have children at an older age, or don't. As many interesting shops/workshops/industries are struggling to find competent workers and their owners will retire, we'll see a massive wave of value and cultural destruction there in the coming decades.
And given the wet eyes from the 40-something "childfree" women I see daily when they get a smile from my todler, I'm not sure it's all chill and cool. I see rather pain, suffering and cope.
But yeah, ok, don't try to argue man, just keep your convictions.