The Peace Pledge Union gives a powerful case against war;

“War, like a disease, can in time be eradicated; and that’s what we should be working to achieve. It means learning to overcome the conditioned belief that armed force is an acceptable way of dealing with disputes. It’s a human weakness, not a strength, to solve problems with cruelty, brutality and murder. As a species we have already matured enough for modern societies to decide that wartime atrocities are crimes; people can be arrested for them, tried and punished. Now we should realise that war is itself a crime against humanity, and grow wise enough to solve our problems another way. ”  Click on the link below for the full article.

http://www.ppu.org.uk/learn/infodocs/st_pacifism_m1.html