Let's revisit history a little as I recall before it's distorted.
Curveball was the *dominant* source for the US administration WMD case - and yet the CIA didn't even know him but by a codename, he was in Germany trying to get to stay, competing with a mass of other Iraqi refugees, where only one in 25 got to stay, and claims like these were how he could get to stay, so he was hugely incented to lie in addition to any 'get Saddam' motive. German intelligence considered him, and told us they did, an unreliable alcoholic.
This is where the 'backdoor' Cheney created to get raw info and 'stovepipe' it for use without any filtering by the CIA was a big cause of the mistake. It wasn't innocent.
The CIA is designed to give the President the best intelligence it can - but sometimes finds itself at odds with policy where the right info inhibits the policy. Presidents have various ways to pressure the CIA to not do their job - one of which is the fact they appoint the Director, who has been known to replace many senior people who won't say what the President wants; Nixon threatened the CIA to expose something related to the JFK assassination (not saying it was a conspiracy, it's just fact that's what he did).
Bush had the Cheney backdoor operation, the unprecedented visits by Cheney repeatedly to pressure analysts, etc.
The administration actively shut down information that undermined the WMD case. Paul Wolfowitz let the cat out of the bag in an article in which he admitted that the policy decision was war in Iraq and that WMD was simply selected as the reason to use for PR reasons as a 'bureacratic convenience' (and likely to try to argue this illegal war was 'pre-emptive' against imminent attack by Iraq under the UN charter we signed). Their trashing Joe Wilson and his wife is just one example of their shutting opposition down. That was less an act aimed at Wilson than a warning shot at anyone else who would publicize information they didn't like (Wilson wrote a New York Times op-ed when the administration ignored his information).
The CIA was practically treated as an enemy by White House war advocates.
Bush ordered the UN inspectors out of Iraq and started the war rather than letting them finish - as that ran the risk of their finding the WMD pretense was false.
Indeed, the administration ran an operation aimed at discrediting the UN inspectors, to try to undermine their finding the WMD's were not there. That's not an innocent mistake.
I've posted some sympathy for the goal of removing Saddam - but the Bush administration's approach was illegal and a disaster. And as Red posted above, it's always a nice reminder to look at what Carter would have done on Saddam in a second term.
Probably not encouraged him in a war with Iran and kept him in power. Or given our nation the shame of telling the Iraqi opposition we'd back them in an uprising and then deciding to keep Saddam and allowing him to slaughter them when they did.