Truth! As you say, if a person can no longer understand what they did to result in being placed in an institution whose nature they can no longer comprehend, what's the point? And what do we owe the formerly reprehensible and now mentally incompetent? I have a formerly reprehensible relative who caused my family a whole lot of heartache but who is now incapacitated with Lewy Body dementia — so there's no longer any point in resenting him, and in a way, that's a relief.