It's not a matter of them being dismantled and moved out. Don't be ridiculous. The UNSCOM team oversaw the destruction of Iraq's chemical and biological weapons stocks and the means of producing them, for seven years. Then, after that, the UN-imposed sanctions kept a pretty strict eye on everything going in and out of the place. It would have been ridiculously difficult for them to have reconstituted their weapons programme in the few years between the US getting the inspectors kicked out and the accusations being made. It would have been ridiculously difficult again for Iraq to hide any such things from the second batch of UN weapons inspectors, even taking into account the US pulling them out before they had been able to properly do their job.
And if there had been any chemical or biological weapons (nuclear was never even a question) in Iraq that the UNSCOM inspectors had missed, none of the weapons have a shelf life of over five years. It would all be useless sludge by now, even if any of it actually existed.
This is not like the German death camps, where there was at least some evidence in support of their existence between the searches began. This is one country, the US, saying for no good reason, "Iraq has weapons, and if they don't disarm, we're invading." Iraq says, "We can't disarm if we're not armed. Send in inspectors to verify." The US doesn't go along with the inspections, and invades anyway. After the invasion began, all talk of disarmament ceased and talk of the liberation of the Iraqi people began. Then, when the invasion had ended, the US government had tricked the US people into believing it was a success, because liberation was achieved and disarmament was forgotten.
And it's ultimately good for Iraq, if the US does manage to keep it under control and set up a local policing body, as it is required to under international law. The Iraqi people will ultimately win out, I think. But the rest of the world has to live with the consequences of the US outright saying, "We don't care about international law, we don't care about due process, we don't even care about having real reasons to invade countries. We'll do it, ignore what everyone says, trick our stupefied population into supporting us, and what can you do about it?"
