Why? Why no more? What's the harm in such emotion? For the day the world has peace is the day we stop caring about another's suffering, our own pursuit of happiness, values, and ideals. Sadly, war is an inevetable part of humanity. Its not because we hate each other, its because we love the ones who have been hurt by the previous struggles. A Peaceful world, is a very empty world indeed, either emotionally (no one cares), or physically (no one's alive).
You shouldn't be asking the fighters to stop fighting, its what they do, you shouldn't