Here's another thing to think about that puts things into perspective historically:
Colin Powell's WMD speech to the UN in 2003

We have firsthand descriptions of biological weapons factories on wheels and on rails.
The trucks and train cars are easily moved and are designed to evade detection by inspectors.
The source was an eye witness, an Iraqi chemical engineer who supervised one of these facilities.
Our conservative estimate is that Iraq today has a stockpile of between 100 and 500 tons of chemical weapons agent. That is enough agent to fill 16,000 battlefield rockets....Saddam Hussein has chemical weapons.
In truth, Saddam Hussein had a massive clandestine nuclear weapons program that covered several different techniques to enrich uranium, including electromagnetic isotope separation, gas centrifuge, and gas diffusion
He is so determined that he has made repeated covert attempts to acquire high-specification aluminum tubes from 11 different countries, even after inspections resumed.
Iraq could use these small UAVs which have a wingspan of only a few meters to deliver biological agents to its neighbors or if transported, to other countries, including the United States. (Re umanned drone planes)
But what I want to bring to your attention today is the potentially much more sinister nexus between Iraq and the al Qaeda terrorist network...
Ladies and gentlemen, these are not assertions. These are facts, corroborated by many sources, some of them sources of the intelligence services of other countries.
All mischaracterizations and lies, what a disgrace this man is________________________
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Petraeus's report to Congress re the Surge on 9/7/07

"The security situation in Iraq is improving..."
"I believe that we will be able to reduce our forces to the pre-surge level of brigade combat teams by next summer without jeopardizing the security gains that we have fought so hard to achieve..."
SEN WARNER: Does that (THE SURGE) make America safer?
GEN. PETRAEUS: Sir, I don't know actually. I have not sat down and sorted out in my own mind.
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Bush fires Generals Garner, Shinseki, Casey, and Abizaid before settling on Petraeus the yes man. Why? They had opinions counter to the Bush mantra of 'progress and stay the course' in Iraq.
I guess history does have lessons for us. Too bad we haven't learned a thing about trusting Bush and his henchmen.