Both your position and TFA's to be perfectly clear. Members of the House, Military, and all of the various intelligence agencies are masses of people with a huge amount of collective knowledge. That "Bob" didn't know something is complete crap, because last time US Security relied on one person was... well, absolutely NEVER!
Saddam had no Nuclear weapons, and the whole story about yellow cake was fabricated by various intelligence agencies to fit an agenda. Everyone in politics and the Military knew it was bullshit, and everyone knew why it was invented by the Italian version of the CIA (which is why they attempted to hide the source). Bush was going to go to war no matter what. It was sold to the public by lots of politicians using every method imaginable (free oil, those damn terrorists, that evil dictator, etc...). The point in the propaganda game is not to convince other politicians of an action, it is to convince the public that the action is justified. That is right, the war was going to happen regardless of public opinion so it was purely justification.
Why do some people that believe politicians are stupid, do things from complete ignorance, and do things without understanding all of the possible outcomes? Well, those same people are quite frankly batshit crazy.