Earlier quoted context omitted.
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 am left wondering. Can’t people (in general) understand that Alzheimer’s changes a person fundamentally, irreversibly and forever until death follows? Many positive traits of personality disappear, the negative starts to dominate, I think mainly from fear and a subconscious awareness of what is being lost. That’s pretty much 101 of grieving when a loved one is struck with Alzheimer’s. The person has left. You conti…
IMHO it is important to see which context people are coming from. Different culture, social acceptance, historic treatment options, etc. influence the response.
Also, dementia is not the only disease with a strong degenerative impact on character and behaviour e.g there is schizophrenia et al. What is common with many of these conditions that there is a strong individual component of progression and morbidity.
It is great that you have the option to make a choice for yourself. Others might decide to make other choices.