Well look at the scenario I am speaking of: lung appears, matches are done, it will match the child, it will not match any adult needing it. So in your book the proper and right thing is: throw it away. In the larger picture the docs and legislators and whatever should fix this partition between the adults and children where a cross-adaptation is feasible. But there is such a thing as standing so firm on “principle” that you become an ass.
The real scenario is desperate parents doing everything for their child. They were undoubtedly shot down up the chain of command (so to speak) and are appealing to the public sympathy. I don’t blame them but its not good government nor good policy..
The medical philosophy "First do no harm" was tossed aside, now it's "First do them in and don't even blink", kind of like Mao who just kept murdering. Keep progressing and killing until we reach leftist "utopia".