From "The Nation"
Defining a Just War October 11, 2001Here is another link that discusses Just War:
Just War TheoryThe principles of the justice of war are commonly held to be: having just cause, being a last resort, being declared by a proper authority, possessing right intention, having a reasonable chance of success, and the end being proportional to the means used.
In my opinion, Afghanistan, in its origins, was a Just War.
More important than the idea of Just War in my opinion is that Afghanistan was a necessary war. Al Qaida committed an attack against civilian targets for the purpose of terrorizing the population of the U.S. (Technically, their attack on the Pentagon was not a war crime as the Pentagon is a valid military target. Their method of attacking the Pentagon was a war crime because of the indiscrinate death of civilians in the aircraft.) The UN and the U.S. demanded that Bin Laden be turned over. They did not do so. In order to attempt to bring the perpetrator of a monstrous crime to justice, the U.S. used about 4,000 soldiers and the Northern Alliance to take down the Afghan government. Once that government was taken apart, we were required as occupiers to ensure reasonable safety of the population until a new government could take over.
Bush screwed the pooch because his target from the onset was Iraq rather than destroying Al Qaida and removing the Taliban government that refused to give him up.
But people who believe that no war can be Just or Necessary are not going to accept any set of circumstances where the conflict continues.