And Ken and I certainly know that you need to reign in the bankers. If there is a lesson to be learned from the financial collapse it is that. But what we believe, and what we argue in the book, is that there is no set of rules, no matter how detailed, no matter how specific, no matter how carefully monitored and enforced, there is no set of rules that will get us what we need. Why? Because bankers are smart people. And, like water, they will find cracks in any set of rules. You design a set of rules that will make sure that the particular reason why the financial system almost collapsed can't happen again. It is naive beyond description to think that having blocked this source of financial collapse, you have blocked all possible sources of financial collapse. So it's just a question of waiting for the next one and then marveling at how we could have been so stupid as not to protect ourselves against that.
What we desperately need, beyond, or along with, better rules and reasonably smart incentives, is we need virtue, we need character, we need people who want to do the right thing. And in particular, the virtue that we need most of all is the virtue that Aristotle called practical wisdom. Practical wisdom is the moral will to do the right thing and the moral skill to figure out what the right thing is.