Now, in WWII, there was a draft. The nation was on a war footing, nearly every American supported the war, sacrificed for the war, did what they could to win the war. The result was that the war was won in about three years. In Vietnam, there was a draft. Only a few supported the war, found the war really necessary, sacrificed for the war. As a result, the war dragged on for a total of 21 years, and we lost.
In the current wars, only the military has sacrificed anything for the wars, the average American has taken no part at all in the wars, and they have dragged on now for a decade.
The point of all that is that we should never go to war unless the entire nation is behind it, willing to sacrifice for it, willing to go and fight, and to do whatever it takes to win it.
WWII was necessary, but neither Vietnam, nor Iraq, nor Afganistan were.
Can't we just turn Congress off and then turn it back on again?
In our view, as a threshold matter, humanitarian intervention that occurs without the consent of the relevant government can be justified only in the face of ongoing or imminent genocide, or comparable mass slaughter or loss of life.
Brutal as Saddam Hussein's reign had been, the scope of the Iraqi government's killing in March 2003 was not of the exceptional and dire magnitude that would justify humanitarian intervention. We have no illusions about Saddam Hussein's vicious inhumanity. Having devoted extensive time and effort to documenting his atrocities, we estimate that in the last twenty-five years of Ba`th Party rule the Iraqi government murdered or "disappeared" some quarter of a million Iraqis, if not more. In addition, one must consider such abuses as Iraq's use of chemical weapons against Iranian soldiers. However, by the time of the March 2003 invasion, Saddam Hussein's killing had ebbed.
Humanitarianism, even understood broadly as concern for the welfare of the Iraqi people, was at best a subsidiary motive for the invasion of Iraq.
In sum, the invasion of Iraq failed to meet the test for a humanitarian intervention. Most important, the killing in Iraq at the time was not of the exceptional nature that would justify such intervention. In addition, intervention was not the last reasonable option to stop Iraqi atrocities. Intervention was not motivated primarily by humanitarian concerns.
War in Iraq: Not a Humanitarian Intervention | Human Rights Watch