I agree one hundred percent. Primary prevention is actually expanding through the Families First federal and state efforts. The evidence for economic and concrete family support is overwhelming. However, government investment in this area is severely limited by our nation's racism. Meanwhile there are many children and adults suffering from child maltreatment trauma. They need care now (tertiary prevention). Unfortunately Medicaid is all we have, so this discussion has been about how to use Medicaid to serve them.
Also unlike some European countries, we do not have a national health system, so there is no macro-policy or macro-budgeting system where money saved by decreasing the need for medical or mental health intervention can be reallocated to primary prevention. The return on investment if this was done is 3 to 10 times.