Peter Daou has a good overview about the lenses used by the right and left.
The unbridgeable divide between the left and right’s approach to Iraq and the WoT is, among other things, a disagreement over the value of moral and material strength, with the left placing a premium on the former and the right on the latter. The right (broadly speaking) can’t fathom why the left is driven into fits of rage over every Abu Ghraib, every Gitmo, every secret rendition, every breach of civil liberties, every shifting rationale for war, every soldier and civilian killed in that war, every Bush platitude in support of it, every attempt to squelch dissent. They see the left’s protestations as appeasement of a ruthless enemy. For the left (broadly speaking), America’s moral strength is of paramount importance; without it, all the brute force in the world won’t keep us safe, defeat our enemies, and preserve our role as the world’s moral leader…
For the less gullible among us, the administration’s alarmist rhetoric in 2002 was a grim farce, and the unfolding of the nightmare we see today was a foregone conclusion. Saddam was no greater or immediate a threat – and arguably a lesser one – than North Korea, Iran, Pakistan, or Saudi Arabia. Hindsight has proven these war critics correct. Few dispute that the threat from Saddam was over-stated – to put it mildly. And evidence continues to mount that the invasion was a fait accompli by 2002 if not 2001. Calling for an immediate pullout from Iraq has nothing to do with capitulation and everything to do with righting a moral wrong and undoing the damage done to America’s moral standing.
Definitely worth reading in full no matter which side you are on.