Thats a decision that society has compelled doctors to make day in and day out, though most do not like to be in this position. However, is spending a few more days with tubes sticking into throat, bladder, needles sticks till there isnt a vein left, bedsores etc really a "life"?
arent you then making the same argument proponents of stronger euthanasia make. religiously I dont think it is accepted that the worth of life is determined by humans.