Eh I dunno about all that. As far as I know, state-run adoption and foster programs really just need the funding to employ (and adequately pay) the right number of people to do a good job. As it sits, most caseworkers and admin staff are so overwhelmed by the kid to staff ratio that they don’t have the time to ensure everything is copacetic in each individual case.
The solution to your point is to keep the private sector as far away as humanely possible.