I've flipped through this thread I didn't read it all: so if this is a re-peat flame me.
First, I strongly believe that there were WMD, Not Nukes (they never claimed they were a nuclear power) but chemical and bio warfare in Iraq, and when we were giving Sadam the ultimatem step down or we'll force you, he moved them to his frines in syrria or in Iran(lesser of two evils), and I believe we know where they are and we're saying "we didn't find them" to calm the general populus. Secondly, regardless of whether they were there or not, Saddam through his actions lead us to beleive that there were - stone cold bluff (I don't know).
In Iraq there were atrocities that violate some of the founding principals of the UN and they should have intervened to protect the people of Iraq, but they're a bunch of weaklings afraid of conflict, when they failed to act, the US stepped in like the neighbor who kick's the pi$$ out of the neighbor for beating his kids.
It was the right thing to do at the time given the facts and inferences we knew then. We'er pot committed now. if we pull out, it'll be civil war and someone else like Saddam will rule again. - This should be a UN thing, but if they can't moxy up the courage to do something, someone needs to.
Moreover I don't think that we'll ever be able to stabalise the region, they've been fighting for 5,000 years. they'll fight for another. I think the only thing we can do is try to enforce the balance of power, prevent one faction from overpowering the rest, which is what we're doing with Iran.