Missouri has tried to remedy this somewhat. We have a state income tax credit for offsetting the costs of adoption. Then the state discovered that 90% of the parents claiming the state tax credit were using it for overseas adoptions, and the state has been trying to get that stopped. It was an unforeseen loophole in the old law.
For some people, the social consequences in their immediate neighborhood,etc. aren't worth it. Even if it's a mixed race baby, people can't mind their own business to save their life.