It isn't about intelligence, it's about wisdom and humility. Leftists don't have mental dysfunctions because they're dumb, they have mental dysfunctions because they are cruel and selfish, and would rather see their own country burn to the ground than ever admit they are wrong about anything. You end up with millions of dead bodies because these same assholes would rather you are face down in a ditch than they just say "oh I guess my ideas are shitty after all". These aren't "dumb people" doing this, it's deeply psychologically disturbed individuals, many who are quite intelligent.