I disagree, I know it's unpopular opinion. However, what led to the Iraq War was among most of all, an international intelligence failure compounded by political leaders who should have required validation. I believe GWB/Blair believed the weapons were there. They jumped the gun.

No! Intelligence reports were very mixed. Bush/Cheney saw what they wanted to see. Anyone who voted for that war could’ve walked down the hall & read the classified documents if they wanted to. Doing so they’d have seen there was far from any consensus among intelligence agencies

That's actually my point. The intel was incomplete. They were making a current case based on what intel validated in the country at a former time. They jumped the gun. But did they lie? They likely really believed that Saddam still had the weapons. And there was precedent.