I don't believe it is about the money anymore. People love sex, but they don't necessarily want to have children, and once efficient contraception and sex education is available to everyone, the subset of "unwanted kids", which might have been more than half of all kids born 100 years ago, mostly disappears. What remains are the "wanted kids", and the harsh truth is that quite a lot of people want 0 or 1 kid at most.
People also aren't even having that much sex lately. The epidemics of loneliness is real. Tell me how you are going to have kids if you never have a BF/GF. That is not something money can cure, this is a deep societal dysfunction mediated by smartphones.
State-provided benefits not driving fertility makes some intuitive sense. The countries with high birth rates are not the wealthy and comfortable ones.
Only thing I think could help is going back to the traditional housewife/houseman with grandparents. Then it would work to get 3+ kids. But right now with increasing cost and rising pension age that seems like a dream.
A productive country will wrangle out the time from its productive members and let the non productive members have kids… which might not be the best approach in the long run.
This thing where we outsource childcare to poorly paid strangers is a social experiment.
Funding that with public money to increase adoption even further is another social experiment.
These social experiments may turn out to be brilliant successes in the long run, I have no idea and I’m not stating any opinion there.
But, the people who call themselves conservatives, probably want to conserve the old practice, instead of trying out more new practices. That is basically what they do.