People don’t not want kids. Lots of people want kids at the right time. Others want it but find they would be unable to provide for their children due to a generation and a half of wage stagnation, along with women not wanting to have to change their profession to “full time childcare”.
Giving people access to childcare is documented to work. There isn’t some magic cultural collapse. It’s just capitalism squeezing everything out of people, and people worn out from it.
https://www.dw.com/en/are-family-policy-reforms-to-thank-for...