In "it will decrease terrorism", the IT stood for conquering Iraq
It did not stand for subsequently waging and ultimately winning a long battle against terrorism in Iraq. Or if it did, then you guys were remarkably unclear on that point, at the time.
Or as Rummy and the Wolfman used to think: ""Their view of the intelligence was much different. Their notion of it was resistance would run away as the few remaining Saddam loyalists were hunted down.""