Democracy is interesting. It's a claim that everyone has an equal right to influence government of the polity. But does it also claim that everyone has a majority to be smart or intelligent or have a high IQ? No.
That's education and nature's job.

I'm just thinking about Trump and the statement "we get the leaders we deserve".

I think TV entertainment did it—McLuhan thought TV stopped thinking and made people primitive and not so clever (an oversimplification of course).

"Musical innovation is full of danger to the State, for when modes of music change, the fundamental laws of the State always change with them." — Plato's Republic

A switch from literary to radio, and then electric visual media is just such a change in 'modes of music'...

I think, globally, feeling smart (very smart), and being out of touch with reality, are consequences of enterainment by TV.

Electric immersive visual media tribalises its consumers. And trbes like wars over territory.

I think it's the main cause for highly polarised politics with little cross-dialogue, that's a feature of so many countries today.
And why 1 side is sure the other is dumb, and the other is sure the 1st is evil, malicious, deceived, and elitist.

(Typically, I have a typo in the 1st tweet of this thread—”everyone has a majority to be smart..." should've read, "everyone has a duty to be smart...".)