"That's an often quoted accusation about Bush but I'm not sure it really amounted to anything more than competing opinions"
I could cite you numerous studies and reports but I am sure you'd just discount them as "fake news" or marginalize their findings as "opinions," ie. you would just cherry-pick.  Perhaps the most damning is a 2008 Senate Intelligence Committee report that had wide bi-partisan acceptance (baseless partisan objection in 3.. 2...).  While its conclusion was most damning about the Bush administration cherry-picking links between Iraq and Al Qaeda it was also very damning about the Bush administrations cherry-picking in general including discounting if not actively undermining intelligence about WMDs and the lead up to the Iraq Invasion.