As far as I know the American process for adoption is totally different to any European countries, but that said, we tend only to hear of the "famous" people who adopt. Mr and Mrs X who are unable to have children don't often make the headlines.
Surely, it is better for children who have lost their parents, or whose parents are unable to care for them to be adopted than to be shunted from one foster family to another or grow up in orphanages?
And better for adults who want children but cannot have them themselves to adopt and give these children love, than turn into unhappy, soured people who go through life saying "If only..."