Why does this matter? Well, because whichever narrative we subscribe to (or, rather, whichever we subscribe to more; I don't think they're mutually exclusive) should determine how we deal with the crisis. As Brooks puts it:
For the record, I, like Brooks, veer towards the stupidity explanation. But which narrative do CoffeeHousers find more persuasive? Your thoughts, please.“
"The greed narrative leads to the conclusion that government should aggressively restructure the financial sector. The stupidity narrative is suspicious of that sort of radicalism. We’d just be trading the hubris of Wall Street for the hubris of Washington. The stupidity narrative suggests we should preserve the essential market structures, but make them more transparent, straightforward and comprehensible. Instead of rushing off to nationalize the banks, we should nurture and recapitalize what’s left of functioning markets."