The children they are trying to adopt are babies that will otherwise be murdered. The life is saved and there is minimal baggage because the child is fresh out the womb.

The majority of the children in the system are older and burdened with a lot of baggage, both emotional and legally. Most require extreme amounts of therapy, are a "package" with siblings, and the parents are often in/out causing drama.

I'm sure you can see how these things are nowhere near the same.