There isn't anything that would make me hand my child over to someone else, whether it was a miscarriage of justice or an alien fucking invasion. Pretty sure most parents feel the same.
Nope.
My children are people. I love them. I want what is best for them.
I don't see them as objects to be handed over or held onto tightly.
This child that they adopted has other parents who should still be the parents.
No parent could deprive their child of that relationship knowingly.
To say to yourself, "yes, the people who made this child, who love this child, who this child will always wonder about, who this child will grow up to resemble, who this child will one day want to meet, who this child will wonder about why they gave them up, they are not this child's parents. This child belongs to me in law and that's what matters."
would be extraordinary.
To not care about your own child's history, about how they came to be your child, to want to keep them no matter what, no, I don't think all parents' love is so shallow and proprietary.
I have seen the hurt in a family member when she found out that her birth parents had stayed together and had 5 more children. That she had just come along a bit too early for them.
We're all still her family, and she loves us, but that was hard for her.
I can't imagine how she would have felt to find out that all those years they fought to keep her and wanted her back but that a legal process was deemed more important.