Conflict: a basic human instinct, helping humankind evolve even while threatening the very existence of the species . . . an instinct that will be as much a part of the future as it is now and always has been.
For all the glories of war-the defeat of evil, the promise of freedom, justice, protection of the innocent, the righting of wrongs, technological innovation, heroism-there are also the horrors:
individual grief, mass destruction, the...