I know what you mean,  I lost my uncle to dementia 2 yrs ago and it is both a sad and terrible disease...Biden appears to be on the fast progression mode, and , while I don't wish him any harm, I don't expect him to make 2021...His brain may want to say one thing, but the cognitive disconnect let's his mouth say something else.. He is way past beginning stages, declining quickly, and the meds to keep him somewhat(?) coherent during interviews cause his brain to crash from fatigue later in day..then they pump him full of meds next morning and start all over.