I don't have a dog in that fight at all, so maybe I don't understand, but I just hate to hear these stories about people hunting down "birth parents" like they're fugitives.
It seems to me that all this searching business does is promote abortion. If a girl has a terrible problem, unwilling to accept responsibility for a child, and facing a decision on what to do, knowing that it might come back decades later to possibly cause tremendous embarrassment might factor into deciding to just terminate the pregnancy. If people want the adoptee to be able to contact them, it's not hard to do, as I understand it. If they don't want to be contacted, seems to me they should be left alone. The talk about "medical background" is baloney. "Birth parent" searches are a wonderful marketing tool for abortion mills.
I've never been involved with either an adoption or an abortion, so the emotions involved are way outside my experience, but from an unemotional standpoint that's how it looks to me.