When you take the perspective out of the "facts", you take the relevance out of the argument.
Another comparison would be the case of conjoined twins. Should one be allowed to demand separation against the desire of the other? Especially if it would result in the death of the "parasitic" twin? There are two women named Dori and Lori (though I think one has since changed her name) joined at the head. One twin has spina bifida and cannot walk. She sits on a wheeled stool and her sister pushes her. If the able bodied one demanded separation, would any doctor seriously consider it if the handicapped one opposed it? BTW, their situation is for their whole lives, not just a few months.