I'm going to choose the 2008 financial crisis. I choose it because, unlike 9/11, no hostile force from outside did this to us. We did it to ourselves. It was a moment we should have pulled the emergency cord and demanded a serious restructuring of our financial systems.
While there were some policy gestures to address the circumstances that led to it, they've been pathetic.
Our biggest sin of all was a failure to reform the way we measure economies. 3/