I know that this song can get groans of "oh no, not *that* song again" but I think that the Eric Bogle song about the aftermath of war really says it for me about the stupidity and futility of killing people to solve problems on a national, international or global scale.

....sorry, lost the title, is it Green Fields of France?

It starts, Well how are you doing, Private Willie McBride, Do you mind if I sit here down by your graveside, etc

His other one called The Band Played Waltzing Matilda also tells of the effects of war on individual lives. Kind of an updated version of When Johnny Comes Marching Home, I guess.

Helen, in Oz