They are getting so dumb they don't know how dumb they are.
"The more you know, the more you realize you don't know."
Dumb people think they know a lot about a subject because they don't know enough to realize how much knowledge they lack.
In interviews in my field, I've had entry-level people rate their relevant knowledge higher than I'd rate myself, even after 10 years of experience. When we test their knowledge, it usually is revealed that they know very little.
"The more you know, the more you realize you don't know."
Dumb people think they know a lot about a subject because they don't know enough to realize how much knowledge they lack.
In interviews in my field, I've had entry-level people rate their relevant knowledge higher than I'd rate myself, even after 10 years of experience. When we test their knowledge, it usually is revealed that they know very little.
After 10 years I still don't know very much.