From the GAO report:
Phase One
Determining Parent's Suitability to Adopt
In the first phase of the U.S. intercountry adoption process, USCIS
determines the potential parents’ suitability to adopt a child who resides
outside of the United States. The INA defines qualifications for prospective
adoptive parents.
USCIS implements this requirement through its 68 domestic offices.
Prospective parents submit to USCIS fingerprints; a filing fee; home study;
proof of compliance with preadoption requirements of the prospective parent’s
state of residence; other documents such as proof of citizenship, age, marriage
license, and divorce decrees; and, in some cases, an Application for Advance
Processing of Orphan Petition (Form I-600A).
The home study is completed by a party
approved under the laws of the prospective parent’s state of residence,
such as an adoption agency, and includes interviews with the family and an
assessment of the prospective parent’s suitability to adopt a child. After
USCIS receives all required documents from parents, the agency reviews
the documents, conducts background checks on all adult members living in
the household, and makes its determination. If USCIS determines that the
prospective parents are eligible to adopt and fit to provide the child with
proper care, then it sends them a Notice of Favorable Determination
Under the INA, the prospective parent of an orphan must be a U.S. citizen and, if married,
apply for permission to adopt a foreign orphan jointly with his or her spouse or, if
unmarried, be at least 25 years old at the time he or she files the orphan petition. Meeting
preadoption requirements of the child’s proposed state of residence is applicable to cases in
which parents are required to readopt the child in the United States.
I think this puts a serious dent in the original argument about "why the US gov't. doesn't do something?"
as it's apparent, they do quite a bit already.