This is the problem when you depend solely on intelligence provided by dissidents, since we did not have anyone in the country at the time providing intelligence directly to us.
There were weapons inspectors on the ground in Iraq which Bush pulled out prior to launching the invasion. The whole idea that "we didn't have the intelligence because we didn't have anybody in the country" is such BS.
I'm talking about imbedded intelligence, such as CIA, not weapons inspectors. Remember, our inspectors were being shuffled around and denied access to many areas prior to the second phase of the war, so that alone provided belief behind the "he must be hiding them" claim which most of the Western nations governments believed.
Uh, no. The matter for Western governments was merely whether the hide of Saddam Hussein and the pursuit of truth and common decency were worth risking the alliance with America about. (And of course, the hides of hundreds of thousands of innocent Iraqis - but that niggling doubt, of course, could be explained away by pointing out that their lives were hardly wonderful under the status quo and that the neocons' rosy scenarios about Iraq's future under the Americans, while highly dubious, could not be dismissed quite out of hand.) And then the issue got even more complex as
eastern Europeans (and also a fewmiddling-sized western European governments. *cough* Spain *cough* Netherlands) felt they had a choice between Western European hegemony or American one... and they chose the further-away and thence less potentially dangerous side, especially since its rhetoric was also much more agressive. By that point, whether or no a country joined the "coalition of the willing" had
nothing whatsoever to do with Iraq anymore.
One of world diplomacy's ugliest messes ever, the whole affair. Of course, it was recklessly engendered by a certain White House administration, which doesn't really clear everybody else. Much as WWI is more the fault of the Germans and the Austrians than anybody else, but still is sort of everybody's fault.