https://www.cnbc.com/2018/07/13/never-underestimate-human-stupidity-says-historian-and-author.html

Historian Yuval Harari says the study of the past has taught him an important lesson for the future.

"One things that history teaches us is that we should never underestimate human stupidity," said Harari, a professor at The Hebrew University of Jerusalem and author of books that have been recommended by the likes of Microsoft co-founder Bill Gates and former U.S. President Barack Obama.