But I think we'd learn more if we took a look at one of my goofs: I supported George W. Bush's idea of partially privatizing Social Security, which he tried to enact after he was re-elected in 2004. This was a close call for me at the time; it seems positively idiotic now that we've experienced the Great Recession -- and the idea of private investment has finally regained proper perspective. Investment is about risk; Social Security is about certainty. A fair amount of certainty is crucial when it comes to retirement. Why, you might ask, was I blind to this simple proposition at the time?