Richard, In WWII, war was declared on us by Japan and Germany, and thus we had no choice in whether or not to fight, no matter the cost.
In Iraq, it is as you said: the cost is upfront, and the benefit (if one exists at all and the situation turns out worse than we hope) is way down the line. Frankly, I could not care less how the Iraqis would answer that question and I am not really sure why you care as well. But as an American, I am looking at American interests, not Iraqi, or Sudanese, or Congolese, or any other persecuted people with whom I have the utmost sympathy. As for 5 years from now, we shall have to wait and see, however seeing as there is absolutely no accountability in government, I doubt anyone will blame the current administration for whatever happens.
Mr. Mahan, You are not piling on at all, merely raising a legitimate issue.