In the May 1, 2008, New York Review of Books British historian Tony Judt published a perceptive article, “What Have We Learned, If Anything” (here), that reviews many of the consequences of past and present wars. He answers the question in his title with a “probably not.”
I need to give one quote that seems to me to capture the counter-productivity of war very well:
“War was not just a catastrophe in its own right; it brought other horrors in its wake. World War I led to an unprecedented militarization of society, the worship of violence, and a cult of death that long outlasted the war itself and prepared the ground for the political disasters that followed. States and societies seized during and after World War II by Hitler or Stalin (or by both, in sequence) experienced not just occupation and exploitation but degradation and corrosion of the laws and norms of civil society. The very structures of civilized life—regulations, laws, teachers, policemen, judges—disappeared or else took on sinister significance: far from guaranteeing security, the state itself became the leading source of insecurity. Reciprocity and trust, whether in neighbors, colleagues, community, or leaders, collapsed. Behavior that would be aberrant in conventional circumstances—theft, dishonesty, dissemblance, indifference to the misfortune of others, and the opportunistic exploitation of their suffering—became not just normal but sometimes the only way to save your family and yourself. Dissent or opposition was stifled by universal fear.
“War, in short, prompted behavior that would have been unthinkable as well as dysfunctional in peacetime. It is war, not racism or ethnic antagonism or religious fervor, that leads to atrocity. War—total war—has been the crucial antecedent condition for mass criminality in the modern era. The first primitive concentration camps were set up by the British during the Boer War of 1899–1902. Without World War I there would have been no Armenian genocide and it is highly unlikely that either communism or fascism would have seized hold of modern states. Without World War II there would have been no Holocaust. Absent the forcible involvement of Cambodia in the Vietnam War, we would never have heard of Pol Pot. As for the brutalizing effect of war on ordinary soldiers themselves, this of course has been copiously documented.” [page 18]