[mcphilip]

It's 180 degrees against the mainstream narrative because it is a ridiculous oversimplification of the crises and misleading in its claims about OTC derivatives. For a serious look into the complex causes of the crisis, I recommend Econned by Yves Smith [1].

My (weak) take on the crisis TL;DR:

Prolonged, low interest rates set by the Fed in the aftermath of the dotcom bubble led to investors looking for better returns outside of AAA bonds. With the introduction of CDOs, investors were given the option of purchasing AAA rated tranches that paid better rates than bonds. The interest in CDOs exploded, leading to weakening of lending standards allowing the housing boom to really take off. From there it gets much more complex, but ultimately the maths on CDOs didn't work out and everything came crashing down.

[1]http://www.amazon.com/gp/aw/d/0230114563