In one thing Vietnam cannot be compared to Iraq, and that is the all-volunteer basis of the US Army we have today. No draft means - theoretically - that all the soldiers who went to Iraq knew there was a possibility, and they accepted it, unless you accept Ehren Watada's ideas as valid (and for the record I do, the history of my family is deeply rooted in the Italian Resistance to fascism and this has a large influence on my ideas).
The absence of a draft is a major distinction in this case.
No compensation, not even a moral one, will ever be paid by the US to Iraq. The US expect their enemies play by the book, but they don't. A twisted notion of sovereignty and the historical lack of interest in foreign affairs shields the general public from the form of self-criticism that both Germany's and Italy's social textures had to endure.
And just to be clear, I'm not comparing the extent of the crimes of nazism, fascism or stalinism to the extent of the violations of International laws (which are - not only in my opinion - still crimes) committed by the US. I know they are completely different things and that the US is a fully formed democracy, but the same rules apply. "We didn't know" is hardly a good justification when someone simply didn't care to listen to the words of the IAEA. They had to know better and now everybody knows they knew better, but the documents were there at the time. Uranium from Niger? How the hell could someone believe to such a blatant Italian intelligence forgery that was ruled out as bull by the Italian investigative press immediately (except of course from Panorama, owned by Berlusconi)?
Powell regrets his stunt at the UN as a painful "blot" in his career, but estimates made by people who were really in the know (and acknowledged worldwide to be so) were already widely available at the time.
The reputation of people who knew what they were doing has been smeared, and since then restored to the shame of all the falling heads in the US government. May Powell's blot hunt him in his nightmares for all his life to come.