Very true. Some even adopt children because they lost theirs due to accidents or illness, and they find a similar look 'replacement' and rely on this kid to remedy the tragedy.
I'll refuse to send any children out to such kinds of families if I work in the folster center. And I agree with you that from the bottom of heart, every child will choose their biological parents.
Everyone has struggling time, not to mention being parents, and they and their children should not be punished by separating from each other!
I admire your brilliance and resilience to analyze this disturbing issue in details after suffering the child abuse.