This discovery should let you update that Bush was even more dishonest than you previously believed.
That Bush seemed to have no interested in actually cleaning up those weapons when there were US soldiers on the ground in that country shows how little the Bush administration cared about WMDs.
What is something you used to believe, preferably something concrete with direct or implied predictions, that you now know was dead wrong. Was your belief rational given what you knew and could know back then, or was it irrational, and why?
Edit: I feel like some of these are getting a bit glib and political. Please try to explain what false assumptions or biases were underlying your beliefs - be introspective - this is LW after all.