Is it possible to unscramble an omelette?

At least twelve Republican Senators are now expressing some degree of concern about the Bush escalation of the war in Iraq. Here's one example:

Nebraska Republican Sen. Chuck Hagel, decorated Vietnam veteran, to Secretary of State Condoleezza Rice as she testifies before the Senate Foreign Relations Committee-

"Madam Secretary, when you set in motion the kind of policy that the president is talking about here, it's very, very dangerous. As a matter of fact, I have to say, Madam Secretary, that I think this speech given last night by this president represents the most dangerous foreign policy blunder in this country since Vietnam -- if it's carried out."