This is all-round amazing. I can understand ethical 'playing God' type doubts in medical cases such as gene engineering and cloning... but why even raise the question here? Seems misguided, to be honest. It's like saying "CPR - why not just let them accept their fate?" or "Electric pads? Why use new invention to bring back the dead?" Why wouldn't you?!? If someone has been in a terrible accident and has stopped breathing, why wouldn't you try to keep their heart and brain healthy for as long as possible? You're misunderstanding the focus of most ethical arguments about 'playing God' here. It has always been the goal of medicine to save lives and prevent illness.