Our entire economic disaster can be traced back to the economic libertarianism of Ayn Rand / Alan Greenspan?

Alan Greenspan, economic prophet and promoter of complete laissez-faire financial markets, at the height of his power said that governments should not even regulate fraud in the market. Greenspan was a close friend and student of Ayn Rand. After the collapse, Greenspan went on record admitting he has been wrong all these years concerning the government's role in regulating the free market. Why can't the rest of the conservative free market foot soldiers get on board with their prophet's change of heart?