By teaching them all to read, we have left them atthe mercy of the printed word.
Knowing how to read without the associated apparatus of the trivium, leaves people open to believing just about anything. You can read words, but knowing what to do with those words, endow them with meaning, and reason with them. (summarization)
Oral cultures with knowledge systems engrained into them would likely have included trivium-esque structures to allow their users to not only better remember to to better think and argue.