Greenspan didn't speak out against Bush and Co, he speaks for them.

He is the "look at the hand" guy who can at this point credibly say things that need to be made public, but can't be through Bush's or Cheney's mouth. He is then the puppet's puppet.

Ali Samsam Bakhtiari looks to be a similar figure. Seemingly turning against a regime, but in reality simple delivering their message. Look for people of high standing, who have recently retired, and you'll see this puppet function everywhere.