Gotta respect their decision. I mean, I see my father falling apart and if he made the decision idk if I'd contest it. He's not able to really go out, has trouble breathing, etc. Staring at the same 4 walls all day until you die naturally isn't the best way to go out. A little bit of you dies mentally every day going through that until you're just old, depressed, and unable to function. Why put them through that misery if they don't want to essentially rot in a bed or chair.