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A decade into a new century, this old architecture is buckling under the weight of new threats. The world may no longer shudder at the prospect of war between two nuclear superpowers, but proliferation may increase the risk of catastrophe. Terrorism has long been a tactic, but modern technology allows a few small men with outsized rage to murder innocents on a horrific scale.
Moreover, wars between nations have increasingly given way to wars within nations. The resurgence of ethnic or sectarian conflicts; the growth of secessionist movements, insurgencies, and failed states; have increasingly trapped civilians in unending chaos. In today's wars, many more civilians are killed than soldiers; the seeds of future conflict are sewn, economies are wrecked, civil societies torn asunder, refugees amassed, and children scarred.
I do not bring with me today a definitive solution to the problems of war. What I do know is that meeting these challenges will require the same vision, hard work, and persistence of those men and women who acted so boldly decades ago. And it will require us to think in new ways about the notions of just war and the imperatives of a just peace.
We must begin by acknowledging the hard truth that we will not eradicate violent conflict in our lifetimes. There will be times when nations acting individually or in concert will find the use of force not only necessary but morally justified.
I make this statement mindful of what Martin Luther King said in this same ceremony years ago "Violence never brings permanent peace. It solves no social problem: it merely creates new and more complicated ones." As someone who stands here as a direct consequence of Dr. King's life's work, I am living testimony to the moral force of non-violence. I know there is nothing weak nothing passive nothing naÏve in the creed and lives of Gandhi and King.
But as a head of state sworn to protect and defend my nation, I cannot be guided by their examples alone. I face the world as it is, and cannot stand idle in the face of threats to the American people. For make no mistake: evil does exist in the world. A non-violent movement could not have halted Hitler's armies. Negotiations cannot convince al Qaeda's leaders to lay down their arms. To say that force is sometimes necessary is not a call to cynicism it is a recognition of history; the imperfections of man and the limits of reason.
I raise this point because in many countries there is a deep ambivalence about military action today, no matter the cause. At times, this is joined by a reflexive suspicion of America, the world's sole military superpower.
Yet the world must remember that it was not simply international institutions not just treaties and declarations that brought stability to a post-World War II world. Whatever mistakes we have made, the plain fact is this: the United States of America has helped underwrite global security for more than six decades with the blood of our citizens and the strength of our arms. The service and sacrifice of our men and women in uniform has promoted peace and prosperity from Germany to Korea, and enabled democracy to take hold in places like the Balkans. We have borne this burden not because we seek to impose our will. We have done so out of enlightened self-interest because we seek a better future for our children and grandchildren, and we believe that their lives will be better if other peoples' children and grandchildren can live in freedom and prosperity.
So yes, the instruments of war do have a role to play in preserving the peace. And yet this truth must coexist with another that no matter how justified, war promises human tragedy. The soldier's courage and sacrifice is full of glory, expressing devotion to country, to cause and to comrades in arms. But war itself is never glorious, and we must never trumpet it as such.
So part of our challenge is reconciling these two seemingly irreconcilable truths that war is sometimes necessary, and war is at some level an expression of human feelings. Concretely, we must direct our effort to the task that President Kennedy called for long ago. "Let us focus," he said, "on a more practical, more attainable peace, based not on a sudden revolution in human nature but on a gradual evolution in human institutions."