My college-educated cousin went to jail for child support problems in a tussle with his ex-wife. He told me he was amazed that almost everyone in the jail was unable to read. This was in Iowa, the state with the highest literacy of all the 50 states! He said he tried to teach some of them as much as he could while there.
I used to work for a sort of technology company and some of those guys were good folks but had no reading or grammar skills at all.
Some of these guys went to a diploma mill for computers and did not know what RAM was, what it looked like, or even the types of slots it typicall fit in.
When the “test project” was closed down on me without nary a direct word and I left, it was reactivated and given to a couple of the poor guys that are propped up and supported by liberal mid-west managers.