They are saying financial incentives should be to force people together vs support single parents. The unsaid part is to encourage, through policy, marriage and traditional family structures by way of less access to secular social safety programs. The problem is that this leads to people being forced to stay in abusive or unhealthy relationships because of someone else's ideology.

If you work backwards further, you'll find you're unable to fix dysfunctional relationships through economic policy. ~40% of annual pregnancies in the US are unintended, so perhaps more accessible family planning is what is needed, so that people who don't want to be parents don't become parents.

https://www.guttmacher.org/fact-sheet/unintended-pregnancy-u...

Information to consume to better understand this mental model: https://ifstudies.org/blog/category/single-parents

"The world is never unhappy because of children who have not yet been born; it is grief stricken by children who have been placed on the planet without anyone to love them adequately. We can cope with fewer children, we can't cope with yet more parents insufficiently dedicated to the tasks of love." -- Unknown