Earlier quoted context omitted.
The parent described someone who went above and beyond the norm of other members in his community in his constant positive interaction with his neighbors, collegues, and former students. It is highly likely this kind of person would give a considerable shit if he knew he would become a nightmare for the same community. There may be others reading in the thread who also can relate to the personality of the teacher and…
There's a difference between "I don't want the disease because I don't want to become a menace to others" (what you're saying) and "I don't want the disease because it would make me lose social status" (what the original commenter said).
I don’t want to go that way either. If I start losing my mind to Alzheimer’s or dementia I don’t want to slowly turn unrecognizable to those who love me, fuck that shit. Give me something suitable and I’ll do it my damn self if needs be.