We're talking adults who don't know who Shakespeare was, can't find Australia on a map, have zero knowledge of applied mathematics, don't have a good command of their own native tongue, etc, etc, etc....
I wonder where those parents got their education?
And as much as many will hate to read it, I have noticed a lot of people, even here, that cannot understand the difference between there, their, they're; or two, to, too. And they were not home schooled.