From Ace of Spades HQ:
Whether the war is “a mistake” depends on its outcome. A victory will be a greivous blow for global bin Ladinism; a defeat their greatest triumph. The enemy has doubled-down in Iraq precisely because they know how important it is to their twisted cause.
If the bin Ladinists believe Iraq is vital to keep in reliably terrorist-friendly hands, it seems to me a pretty good indication that it’s a war worth fighting. Even given what we know now.
I can’t improve on it, so I’ll just link to it. Go read the whole thing.