You see.. this is the issue. This idea has been passed around second hand so many times people are convinced there was no evidence or reason to suspect a WMD program. The idea the US government made it all up out of thin air for neocon warmongering reasons is too juicy to ignore..

HOWEVER

The UN weapons inspections DID find plenty of evidence to be concerned about, and Saddam's provable track record of chemical weapon use AND lying AND concealment only made it harder to know what was going on. One of the lead inspectors, British weapons expert David Kelly, who led missions to Iraqii factories and staff sites dozens of times said...

"despite the steps taken, Saddam refuse[d] to acknowledge the extent of his chemical and biological weapons and associated military and industrial support organisations [and there was still a concern about] 8,500 litres of anthrax VX, 2,160 kilograms of bacterial growth media, 360 tonnes of bulk chemical warfare agent, 6,500 chemical bombs and 30,000 munitions capable of delivering chemical and biological warfare agents [which] remained unaccounted for from activities up to 1991"

David Kelly thought the "launch in 45 minutes" claim was bollocks. He also thought various US attempts to say certain equipment could be quickly turned into launch vehicles or chemical weapons processing plants was also bollocks. He also said the link to Al-Qaeda was bollocks.

However, he wrote an entire article for a British newspaper outlining how based on evidence he had personally seen as a part of UN sanctioned missions, Saddam was committed to a chemical weapons programs, their use was inevitable, and only regime change would stop it.

"Iraq has spent the past 30 years building up an arsenal of weapons of mass destruction (WMD). Although the current threat presented by Iraq militarily is modest, both in terms of conventional and unconventional weapons, it has never given up its intent to develop and stockpile such weapons for both military and terrorist use....The long-term threat, however, remains Iraq's development to military maturity of weapons of mass destruction—something that only regime change will avert."

You can read it yourself here: https://www.theguardian.com/politics/2003/aug/31/huttonreport.iraq

David Kelly killed himself shortly after the war started because he name was publicly outed as a critic of the "45 minute" dossier. Conspiracy theories abound. But centre on Kelly undermining the British and American governments - which is why "supposedly" they had him killed.

But even he - a distinguished weapons expert, known internationally, with decades of experience, dozens of missions to Iraq, who inspected Iraqii equipment personally, and who thought the US and UK governments were full of shit exaggerating - even he believed the evidence was such that regime change was the right thing to do, to avert chemical / nuclear disaster.