Clearly I live in a different reality from you.
I am sure that most people remember very well the frustration of US defence department officials because Blix repeatedly provided cautious reports to the Security Council about the hunt for banned chemical and biological weapons in Iraq, noting that no evidence had been found that Iraq had resumed their production.
The above "reality" is the one that most people will find familiar rather than your version that has Blix supporting the idea that Iraq had WMD.
As for Neville Chamberlain; not sure of your point, at the time I believe the USA had a policy of isolationism that continued until Pearl Harbor was attacked? I see no similarity with the Iraq situation.
Re the UN: I quite agree, had matters had been left to the UN all along, they would be criticised and villified for "doing nothing" and not finding the WMD. But you find a way to blame them anyway, with the French for good measure.
JR
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1