As with Senator Feinstein, where are their loved ones? Spouses, children, caregivers??? Where are the people who should be helping and guiding people to step away gracefully before they get to this point?
I know of a woman who had dementia, was in total denial, and would not broach suggestions that "she was crazy". Her family was just trying to get rid of her and steal the house out from under her. She lived out her life in fear and paranoia, lashing out at everyone around her, until nobody came near her at all. She died frightened and angry that nobody came around any more.
Her husband thought he was "protecting her" by keeping her calm, and not letting her get upset. He was enabling her worst behaviours, and driving family away. It was very sad.