> But, it's not the same thing at all, because if you were to separate yourself from the violinist, they would die from their disease / from not being given very extraordinary aid, but if you were to separate yourself from the fetus, it would die from not being given very ordinary means of sustenance.

Why does whether it's a common (pregancy) or uncommon (violinist hooked up to sleeper) occurrence alter the moral status of disconnecting the person who is reliant on their connection to another for their continued existence?