Whenever former Bush administration officials claim that "everyone thought Saddam had WMD," I remember back to March of 2003 when I watched on television in my college dorm room as Hans Blix gave his report to the UN. His speech was quite straight-forward: There was no evidence that Iraq had WMD, but there was no evidence to support Iraq's claim that they had destroyed all their weapons. Iraq was beginning to cooperate and more inspections were needed to gather evidence of either WMD or the lack thereof. It took two years for the UN to put together the inspecting team. After two months, the US was ready to invade. Indeed, they had been building forces since 2002 for just that purpose.
After the invasion, we discovered what inspectors would have probably soon uncovered: Iraq had stopped pursuing nuclear weapons in the 90s. In fact, evidence of this had existed in the form of information from defectors, previous inspections, and vows from every major Iraqi leader that they had destroyed all their chemical and biological weapons. The only question was whether or not Iraq had started up their weapons program in 1998. It was clear they did not have nuclear weapons. There was no hard evidence that they had any chemical or biological weapons. At best, the world was suspicious. This was enough for the US to push for invasion, against the wishes of the entire world, due to post-9/11 paranoia about terrorism.
Blix knew that inspections could work if they were firm, but respectful and beholden only to the UN. In taking over the process, Blix was caught between the U.S., who thought he wasn't forceful enough in his work, and the Iraqis, who thought he was a spy for the U.S. Iraq made matters worse by playing a cat-and-mouse game purely out of obstinance/pride. They had nothing to hide, but felt like opening their country to inspections would lead to humiliating searches of private palaces or political locales. They were essentially saying, "Trust us: we don't have weapons." Ultimately, the U.S. wanted to control the inspectors, to make them an arm of the CIA and to gather intel, whereas Blix was clear that none of that would occur. The simple truth was that the US didn't want the inspections to succeed because that would have led to lessening restrictions on Iraq, and the troop build-up would have been for nothing. It would have kept Saddam in power, which they could not tolerate. Likewise, the Iraqis didn't want the inspections to succeed (despite being in their own self-interest!) for fear of looking weak and powerless, or perhaps out of stupid pride.
The greatest insult came when the US attempted to paint Blix as inept or wrong--going so far as to spy on him and his inspectors--an ironic twist considering it was the US that ended up passing on bad intelligence. In the case of the infamous yellowcake intel, the CIA KNEW the information came from a forged document. Blix is surprisingly polite and even-handed in his criticism of the US, considering they did nothing less than try to destroy his credibility through lies and espionage. His conclusions are direct and factual, without any malice: "What we came to discover was that no sites given to us by intelligence were ever found to harbor weapons of mass destruction."
Blix continually emphasized that inspections were an alternative to war, not a prelude. Unfortunately, the US felt otherwise. We can learn quite a bit from Blix's book: 1) containment (through inspections, surveillance, and diplomacy) WORKS and is less costly (in money and human life) than "counter-proliferation" (military action). 2) Lack of evidence that weapons have been destroyed is not the same as evidence that they exist. 3) Inspections work when inspectors are given strong intelligence, but are independent and report only to the UN. 4) The Security Council can never again allow one nation to act unilaterally to go to war, as the US did. 5) "Preemptive wars" undercut the whole purpose of the UN in using international diplomacy to ensure military conflict is a last resort.