The correct answer to the question, Knowing what we now know, would you have invaded Iraq? is: Knowing what we now know, I would not have pulled our troops out.
Agreed. While all of the "knowledgeable observers" are wringing their hands about W entering into Iraq precious little is being said about the ruinous decision that grasped defeat from a hard won victory.
From Libya to Afghanistan to Yemen the region is enflamed and the people holding the torch and the gas can are our loyal Iranian allies.
The only stable countries across that broad crescent are Egypt and Israel who, not coincidently are on our leader' sh!t list.