You dare to mention the man who, more than anybody, got us into the mess we find ourselves in today. The housing bubble was mainly a result of his policies. He actually recommended that home buyers get ARMs instead of fixed rate mortgages back in 2004 when he had Fed Funds rates at 1%.
Greenspan talks out of both sides of his mouth. He's inclined to be a little more honest and straightforward since he retired, but citing Alan Greenspan on the economy is rather like citing Rumsfeld or Robert McNamara on war policy.