Taking ethics out of context, squashes the very life out of it. The related context is the whole ball game. Further, pretending one thing is like another (adult violinist dependent on your kidney; foetus dependent upon mother) erases several critical ethical points in an obvious attempt to argue toward a conclusion. Its disingenuous.

A simpler example: Killing a convicted murderer, is murder again! Oh, except the murderer has a whole different ethical context than say a child: the murderer is again a threat to more people; the murderer had agency and could have decided not to murder; the act has societal benefit instead of harm; and on and on.

And if you don't like my argument, then voila! Taking your ethical dilemma and recasting it as mine seems "not fair!" to you. Which ironically is my point and QED.