Dementia is a spectrum of neuropathology, so you’ve effectively ignored my question. But ok, let’s go with your specific example. Why would you keep your father alive in such an undignified state? You’re describing him as playing with “child-level jigsaw puzzles,” meaning he's barely sentient and someone has to wipe his ass, which is a horrifying indignity. Literally my idea of hell. Are you punishing him? Are you punishing yourself?

Humans are supposed to transcend the mortal realm, so why this obsession with remaining alive even at the expense of everyone around you? I guess I’ll never get an answer.