Murray Rothbard on determining the aggressor in war

Just because all sides share in the ultimate State-guilt, does not mean that all sides are equally guilty. On the contrary, in virtually every war, one side is far more guilty than the other, and on one side must be pinned the basic responsibility for aggression, for a drive for conquest, etc. But in order to find out which side to any war is the more guilty, we have to inform ourselves in depth about the history of that conflict, and that takes time and thought--and it also takes the ultimate willingness to become relevant by taking sides through pinning a greater degree of guilt on one side or the other. 

~ Murray Rothbard, "War Guilt in the Middle East," 1967