I would take my 91 year old mother with advanced Alziemer's Disease (she died last year).
over my raging violent Alcoholic husband any day of the week. (he died at age 54 , 3 years ago).
If you have ever lived with both for an extended time, you might think differently.
people with advanced progressive dementia, can still have remarkable capability to remember, it's just the short-term memory that goes...that part of the brain is dying off. (at least that is how it was explained to us). I watched my mother's frustration at losing her memory....my XH just didn't give a flying *****, he was selfish to the core.