That's just the way it is!
I think nowadays things often come down to money - before I had my son, I never for one moment thought about the cost of raising him, as I am sure my parents didn't with me and my siblings.
Then someone that must have more time on their hands than they know what to do with, sat down and costed everything out.
I have a niece that doesn't want children.As a schoolteacher, she says she sees enough of the best and the worst of them !
My younger brother and SiL and my sister all reckoned they didn't want children, my brother and SiL had twins and my sister had the one boy - if it happens, it happens ! Each to their own and no one has a right to criticise other people's choice.