It's all about information capture.
None of this would have been possible pre-internet and the ability to silo yourself and then fully exist within algorithms.
I have extremely "book smart" friends who are now MAGA and will tell you, straight to your face, that Ukraine invaded Russia, the 2020 election was stolen, vaccines are all bad ... on down the line.
You wouldn't believe it until you witness it from people you know, and know well ... and whom you knew in 2015 and before.
It's so broken that it's basically impossible to convey how bad this is.