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I found this interesting.

A hidden assumption underlies the debate over North Korea. The assumption is that preventive war—war against a country that poses no imminent threat but could pose a threat in the future—is morally legitimate. To be sure, many politicians oppose an attack on practical grounds: They say the costs would be too high. But barely anyone in the foreign policy mainstream calls the idea itself abhorrent.

By historical standards, that’s astounding. Over the past two decades, American foreign policy has undergone a conceptual shift so complete that its current practitioners don’t even acknowledge how revolutionary their current views are. During the Cold War, the dominant figures in American foreign policy considered preventive war to be fundamentally un-American. A member of the Truman, Eisenhower, Kennedy, or Reagan administration, transported to 2017, would wonder how their successors embraced a principle that they associated with the regimes America fought in World War II.

https://www.theatlantic.com/internat...ive-war/523833