It's wasn't clear at the time (pre-2003) that it was going to end up as a catastrophe. Furthermore the Economist always mentions now that they supported the invasion -- they've never sought to hide the fact.
If you are not aware of the many, loud critics during the lead up to the invasion, then you need a more diverse portfolio of news sources. Scott Ritter alone, remember him? He was an actual intelligence officer and weapons inspector who spent years in Iraq, and who went on TV numerous times during the lead up, strongly arguing that an invasion would be a disaster. So yeah, it was plenty clear to many people.
At the time it was far from clear that Saddam Hussein did not have weapons of mass destructions. In fact, there was ample proof he had used those weapons previously on Kurds and American intelligence reports claimed he had more where those came from (which turned out to be false, of course, but who knew). There was no way to know that Bush would bungle the whole rebuilding phase and let Iraq slide into anarchy.
Hindsight is always 20/20. At least they owe up to the fact that they changed their opinion, I know lots of politicians who'd rather chose to rewrite history instead.
"""At the time it was far from clear that Saddam Hussein did not have weapons of mass destructions. In fact, there was ample proof he had used those weapons previously on Kurds and American intelligence reports claimed he had more where those came from (which turned out to be false, of course, but who knew)."""
Everybody in the world knew, except American's watching FOX News and giving any basis on Bush era "intelligence reports". Weapons of mass destruction, my ass. Just an excuse to attack on the same man that was a valid us ally for decades (like in Iraq/Iran war era).
I debated the WMD topic in high school pre-Iraq war and the expert consensus was that Iraq had chemical and biological weapons. Arguing otherwise was a losing debate. It may have been obvious that invading Iraq would be disastrous, but it wasn't obvious that they didn't have WMD. The experts had little information and were misinformed.
The tone of your response to the OP is belittling and adds little to discussion of what experts knew or thought they knew. You think the Economist relied solely on Fox News and Bush intelligence when believing that Iraq had WMDs?
Which experts are you referring to? Pundits on tv? The president? The head of the CIA? The president had an agenda that he wanted to pursue since 2001. Him and his staff were selective in what information they believed. The director of the CIA unfortunately told the president what he wanted to hear. Pundits on television took them at their word.
There were people who said there was no evidence that Iraq had WMD, and they were ignored. This is not a case of "they did the best with the information they had." This is a case of "they made their conclusions first, and looked for the evidence second." Books that touch on this subject: "Plan of Attack" and "State of Denial" by Bob Woodward; "Legacy of Ashes" by Tim Weiner; "Your Government Failed You" by Richard Clarke.
"""I debated the WMD topic in high school pre-Iraq war and the expert consensus was that Iraq had chemical and biological weapons."""
What experts? Bush appointed bozos? Media pundits, the John C. Dvorak's of the political world? "Intelligence" agents? The whole WMD charge was a thin veiled excuse of invasion to take control of the petrol supply. They could care less about WMD, not to mention that it's not the US job to say what another state should or should not have those. Doesn't the US have WMD aplenty? Doesn't Russia? Doesn't half of Europe? Doesn't Israel? I don't see any invasions there.
Just think how difficult it is to get accurate and intelligent tech reporting in the US media, and then think how more difficult it would be if there is political pressure and huge economic and geo-strategical interests.
"""You think the Economist relied solely on Fox News and Bush intelligence when believing that Iraq had WMDs?"""
No, I believe that the Economist in general tries to accommodate the interests of the ruling economic elite. It's FOX News for rich, neoliberal people, and in fact it wears its biases on its sleeve.
Forget all the experts: You have a mad men who previously used WMDs on his own population, flagrantly ignored 20 UN resolutions to give them up, actually claimed he had WMDs at some point, and now all of a sudden he has given them up just like that?
You can claim that is "obvious" behavior now that we haven't been able to find them, but it really wasn't obvious back then. A lot of mistakes were made, the Economist concedes that too, but rewriting history to fit your cause really isn't helping the debate.