There are some good lessons in this article on financial fraud:
That's how we got it so wrong. We were looking for incidental breaches of technical regulations, not systematic crime. And the thing is, that's normal. The nature of fraud is that it works outside your field of vision, subverting the normal checks and balances so that the world changes while the picture stays the same. People in financial markets have been missing the wood for the trees for as long as there have been markets.
Trust -- particularly between complete strangers, with no interactions beside relatively anonymous market transactions -- is the basis of the modern industrial economy. And the story of the development of the modern economy is in large part the story of the invention and improvement of technologies and institutions for managing that trust.
And as industrial society develops, it becomes easier to be a victim. In The Wealth of Nations, Adam Smith described how prosperity derived from the division of labour -- the 18 distinct operations that went into the manufacture of a pin, for example. While this was going on, the modern world also saw a growing division of trust. The more a society benefits from the division of labour in checking up on things, the further you can go into a con game before you realise that you're in one.
Libor teaches us a valuable lesson about commercial fraud -- that unlike other crimes, it has a problem of denial as well as one of detection. There are very few other criminal acts where the victim not only consents to the criminal act, but voluntarily transfers the money or valuable goods to the criminal. And the hierarchies, status distinctions and networks that make up a modern economy also create powerful psychological barriers against seeing fraud when it is happening. White-collar crime is partly defined by the kind of person who commits it: a person of high status in the community, the kind of person who is always given the benefit of the doubt.
Fraudsters don't play on moral weaknesses, greed or fear; they play on weaknesses in the system of checks and balances -- the audit processes that are meant to supplement an overall environment of trust. One point that comes up again and again when looking at famous and large-scale frauds is that, in many cases, everything could have been brought to a halt at a very early stage if anyone had taken care to confirm all the facts. But nobody does confirm all the facts. There are just too bloody many of them. Even after the financial rubble has settled and the arrests been made, this is a huge problem.