There is a wise old adage said by George Santayana, and Edmund Burke and perhaps even Winston Churchill, referring to those who don't learn from history are condemned to repeat it. Perhaps it has been said in relation to war, which of course is still happening throughout the world. It's one thing to speak these wise words, it's another to live by them.
The state of our society proves this to be true, again and again, that we don't appear to have learned enough from our historical mistakes.
Doing the same thing over and over, expecting a different result has been described by Albert Einstein as being insanity. There is much insanity in the world at present and it seriously makes one wonder if our world has ever been sane or if it ever will be.
Learning about the Sinclair Lewis book It Can't Happen Here on Ideas gives real insight into why we need to learn from history, especially from our mistakes, and to know that yes, it can happen here.