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Before the Iraq war began in March 2003, the elected representatives of the American people, the US intelligence community, and large portions of the American press were in lockstep with the Bush administration: Iraq had weapons of mass destruction in large quantities and something had to be done.

Central Intelligence Agency (CIA) Director George Tenet said US evidence of the danger posed by Saddam Hussein's Iraq amounted to a "slam dunk," Secretary of State Colin Powell waived a vial of fake anthrax at the United Nations and went on at length about biological weapons program that could kill tens of thousands of people, and the nation's newspapers battled to carry the most breathless "scoops" possible, spoon fed by obliging but anonymous sources.

It was, of course, all completely false. And as President Obama stands on the brink of military action against Syria over claims that the government of Bashar al-Assad used an as-yet-unspecified chemical weapon near Damascus earlier this month, the press and the intelligence community are doing what they failed to do then: Push back on claims of certainty – and assertions that a military response is warranted.

The comparison can be overdone. Obama and those speaking for him have insisted that there will be no invasion and that there's no plan to replace Mr. Assad by force. Polling shows a US public that wants to stay out of a war in Syria (a recent Reuters poll found 46 percent of Americans opposed to military intervention if Assad had used chemical weapons to attack civilians, with 25 percent supporting military action). And there's pretty strong evidence that a chemical weapon of some sort really was used on the outskirts of Damascus on Aug. 21, with Doctors Without Borders saying about 350 people were killed and many more injured by what appeared to have been some kind of neurotoxin.

But the history of the Iraq war is informing the discussion of what happened and what the US knows about it in a healthy way. Exhibit A for this is an Associated Press story this morning which quotes unnamed intelligence officials pushing back on Obama's claims.

Yesterday, Obama told PBS "We have concluded that the Syrian government in fact carried these out. And if that's so, then there need to be international consequences." Today, AP quotes multiple US officials as saying precisely the same thing: That US intelligence on the matter is "not a slam dunk."

A decade ago, US intelligence was stovepiped to present desired conclusions by government officials, and the reputation of the CIA and other intelligence outfits took a serious hit when the truth came out. This time, a much clearer picture is being presented on what they know, what they think happened and can't prove, and how much they don't know at all.

Most important, US intelligence officials say they don't know where all of Syria's chemical weapons are or whether Assad was involved in giving an order for chemical weapons to be used. That raises serious questions about what exactly proposed air strikes would target. 

And then there's the question of whether attacking Syria serves US interests, or humanitarian ones, at all. Among people who follow the region closely, there are many doubts.

Political scientist Marc Lynch, writing at Foreign Policy, can't see much good in attacking Syria, and worries that it will lead to broader US military involvement, however much Obama insists that won't be the case.

He isn't the only one worried about a slippery slope to war. Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff, wrote in July about the lessons the Iraq war and the law of unintended consequences as he outlined possible US military approaches to Syria. He specifically addressed a mission to contain Syria's chemical weapons: 

Joshua Foust wonders why the US would intervene in Syria when so many other humanitarian disasters are ignored, and worries that US intervention on the scale proposed could lead to more bloodshed, not less, in the country.

To be sure, some in the US think punitive strikes won't be enough and are urging Obama to do far more. A group of 74 pundits and former officials, many of them major backers of the Iraq war, released an open letter to Obama on Tuesday calling for immediate action to help the country's rebels defeat Assad:

Signers of that letter include Paul Bremer, Karl Rove, Dan Senor, Doug Feith, and Leon Wieseltier, men inside the government and out who insisted that the invasion of Iraq was the right thing to do and would herald a new era of freedom and peace in the Middle East. They are urging their counsel be taken once again.

Will it? This afternoon, Secretary of State John Kerry and Secretary of Defense Chuck Hagel are briefing Congress on military options for Syria and the US has moved Navy destroyers into striking distance in the Mediterranean.

But at the very least, if the US does move toward war with Syria, it will be with a government and a public whose eyes are far more open to the dangers than they were a decade ago.