We are going to hell
When the present that you live in, explains History, the Dark Ages, the Nazis, and all the horrible insane human behavior you dismissed as part of a barbaric mindset, due to the primitive minds, and the stupidity of our ancestors.
Guess what? We have not changed a bit. What happened in the past, did not happen because it was the past, and people were less intelligent or knowledgeable. It happened because people had beliefs, and they never learned to exchange, but needed to impose their will and beliefs, or they were scared, manipulated, and so on.