Well of course, because they don't need it due to the fact that it's already there in the form of socialized retirement.
Remove socialized retirement , pension funds etc. and people will start having more kids as they'd start seeing them as a retirement insurance yet again. As they were seen for the whole history of mankind (and still are in high fertility countries).
It's time we face the fact that people don't make kids out of love but out of need. If you remove the need and you'd remove the kids, which is what is happening.