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The danger in international politics is that reasonable, defensive behavior can lead to a self-perpetuating downward spiral of action and reaction that produces an outsome no one desired.
Bruce Russett and John R. Oneal in Triangulating Peace: Democracy, Interdependence, and International Organizations
Fear-based reactions are the bane of humanity and keep us from implementing peace through love. Defense turns into constant offense - almost always through force and violence - all in the name of sovereignty and security, instead of human dignity and collaboration.