The question everyone wants to know and use as a tool in defense of their ideology....

Here is a good view that supports mine.

The money quote"
● Central banks created a monetary bubble that fed an asset price boom and distorted the pricing of risk.
● US government policy encouraged high-risk lending through support for Fannie Mae and Freddie Mac (which had explicit government targets of providing over 50pc of mortgage finance to poor households) and through the Community Reinvestment Act and related regulations."

see here: http://blog.iea.org.uk/?tag=verdict-on-the-crash

Hat tip www.acton.org