We've now come into an era where there is also an abundance of information: Pretty much anything you can imagine is just a button-click away.
Young people in particular have to carefully select what information to consume, and there's a whole attention-economy built around wasting people's time, trying to manipulate them into buying shit they don't need.
Humans didn't evolve in such conditions - everything was always scarce. So I think that's why a lot of people have a hard time dealing with it. I believe there's a huge potential market for software that acts in the interest of the user, helping to deal with this abundance of information (pretty much all software that currently exists mainly works to the benefit of the company, in particular ads/data collection). But it doesn't need to be that way. So let's build solutions.
My hypothesis is the availability of low quality passive entertainment 24/7 - namely tv - is what leads to iq scores declining.
When did tvs become affordable for everyone, 1970s perhaps?