BOB ABERNETHY, anchor: The principles of a just war are well known in religious thought. Now, as Americans weigh the pros and cons of leaving Iraq, a conversation about a just exit. What are the moral considerations of pulling out?

William Galston is a political and moral philosopher and a senior fellow at the Brookings Institution in Washington. Nancy Sherman has taught ethics at the U.S. Naval Academy and is a University Professor at Georgetown University. Her latest book is STOIC WARRIORS. Richard Land is president of the Ethics and Religious Liberty Commission of the Southern Baptist Convention. His new book, THE DIVIDED STATES OF AMERICA?, is about to be published.

Welcome to you all. Richard, what are the top moral considerations in this discussion about what to do in Iraq?

Dr. RICHARD LAND (President, Ethics and Religious Liberty Commission, Southern Baptist Convention and author, THE DIVIDED STATES OF AMERICA?): Well, I think that just war has as one of its most important principles is proportionality. What are the costs of staying and the costs of going? And I think it's very important for us to take into consideration at every step the Iraqis who have believed in us, the Iraqis who have cooperated with us, the Iraqis who have fought side by side with us. Twelve Iraqi soldiers have died for every American soldier that's died in this war, and we cannot have a repeat of the disgraceful exit we had from Vietnam, where we left our friends behind to a terrible fate.

ABERNETHY: And what does that mean? Does that mean asylum for refugees? Does it mean -- what does it mean?

Dr. LAND: Well for me it means all who want to leave, we help them leave. We protect them. In the North, if the Kurds want to continue to have freedom, we do what we can to help them defend themselves. I mean, Kurdistan is pretty much pacified.

ABERNETHY: Nancy, what are the top moral considerations for you?

Professor NANCY SHERMAN (Georgetown University and author, STOIC WARRIORS): For me, just war needs to include, although it doesn't always, the obligation to our own troops. And so sending more troops out, given the way they've come home already, to me is an enormous moral peril.

ABERNETHY: Do you mean the "they" meaning the wounded?

Prof. SHERMAN: The wounded, and 19-to-1 are coming home surviving their wounds. And the care is enormous, with post-traumatic stress disorder, limb replacement. To send more in that kind of environment where they come home -- all war is ugly. This one, given the nature of the war, the injuries are greater and I think the moral complexities of the war that soldiers face when they're there is something we don't often talk about. There's enormous corruption, enormous moral ambiguity in who the enemy is and how you target the enemy when you're fighting, and difficulty in separating police-fighting from war-fighting. So the exposure of a long life, of after-life of war, to our troops is really critical and an important part of thinking about just war.

ABERNETHY: And that concern for the troops to you adds up to an early exit?

Prof.. SHERMAN: It adds up to an early exit and to taking very seriously what we've learned from those who have already come home.

ABERNETHY: Bill?

Professor WILLIAM GALSTON (Senior Fellow, The Brookings Institution): Well, let me offer an analogy. You run into someone who has a problem, someone in need. You decide to try to help, but through lack of knowledge, lack of competence, you commit sins of omission as well as commission that in some respects make the problem worse. At that point you have incurred a moral obligation to deal with the consequences of your well-intentioned effort. We have generated or contributed to the generation of enormous refugee flows. We have direct moral responsibility to those refugees. Not only that. Thousands and thousands and thousands of Iraqis have directly cooperated with us in our effort to effect a transition to democracy. And if, God forbid, we have to leave with the mission not completed, we have a direct moral obligation to them as well.

ABERNETHY: And you were one of the most vigorous and public opponents of going in there in the first place. But now you see a situation that requires us to perhaps stay longer than we want to.

Prof. GALSTON: As the Greek philosopher Heraclitus said more than 2000 years ago, you cannot step in the same river twice -- not even the Tigris or the Euphrates.

ABERNETHY: So let me ask you this. By our presence there, a foreign occupier, are we doing -- is the result of that to do more harm than good, and does that mean that in order to accomplish the ends that we have to get out?

Dr. LAND: I think the Iraqis are very ambivalent about our presence there. A lot of them understand that things could get very bad if we leave, that there could be a bloodbath. In fact, I think there's a danger of a regional war between the Sunnis and the Shia, with people coming in from outside.

ABERNETHY: The Administration argues --