Imagine we erect Statues of all things that we've learned from "Humanities Past"- That we know where Negative/Harmful.
In a Cave like setting;
Place this Great Statues, for example one of great figures like " Hilter ", then a sign hanging around it's neck a writing as such;
"My name was Hitler, I was proud to be a part of a thought, and a Matyr of What doesn't Work, I completely went against the Laws of Nature, so here I stand to show, remind all - This is what I did, always remember what I did, so as not to do it anymore"
Allegory of the Cave;
See the Similarites?