We all make some bad decisions: small ones, like buying those adorable shoes that were on sale but hurt your feet. Or colossal ones, like taking a bad job, investing in a doomed start-up or doomed-to-fail product, marrying someone obviously incompatible or invading a country.
Why do smart people make dumb decisions?
Well, I happen to believe that the confirmation bias is often the culprit and pretty much at the root of many bad decisions and most human nearsightedness and meanness. It is why we get blindsided when the clues were there all along.