When I was about 12 I was asked, along with about 20 other kids my age, to write down the lesson we thought everyone had learned and would remember about the whole 20th century.
My answer was "vaccines good, nazis bad". I had to ask someone else to write it down for me because I hadn't been taught how to read or write. But I genuinely believed it. I honestly thought we had all learned that those two things were very obvious and we would all carry on forward from that baseline understanding.
I was so naive.