using a devastating neurological diseases as an insult, is wrong, but using it a a reason that he shouldn’t run a country is fair.

I don’t necessarily disagree but you also run the risk of distracting from the most dangerous part about him. He is a fascist, that is what is wildly dangerous about him and as much as it is fun to make fun of fascists for being dumbshits, it isn’t a lack of mental capacity that leads to fascism. Those two things are perpendicular and as tempting as it is to equate fascism with stupidity the far more terrifying truth is that it only really equates with ignorance.