In a word, yes. I think that morality does have an impact upon warfare. In WWII, we were fighting an organization that was atrociously immoral in it's actions amongst it's own people. The Holocaust was not only grossly evil, it was self-destructive- think of the manpower lost, think of the manpower spent committing this mass murder, think of the fear it created within the Nazi Empire and the discontent amongst those who didn't believe that this was either necessary or good. Good PR is invaluable. If you can be viewed as the good guys, occupation and invasion become easy because the people are on your side. The problem in Iraq is that they already have numerous reasons to distrust us as the good guys, given how badly we fucked up the Gulf War. And the sanctions that only tightened Saddam's regime and killed hundreds of thousands through starvation and disease. I think we're at the point in history where anyone who recommends sanctions as a measure to be taken in international affairs, ever, needs to be slapped.