War sucks, but there are times that it is a necessary evil. What would our world be like if we never defeated Nazi Germany and the Axis powers in World War II? Could you make the argument that we'd be better off with a Europe ruled by the Third Reich and an Asia ruled by Imperial Japan? If the American Revolution never happened, could you argue that we'd have the same quality of life as we do now, under the British Crown? Hell, Canada is still property of the United Kingdom, after all these years. It's not even a real country, it's classified as a "dominion", which is not the same as a nation-state.
War has its purpose. War is bad, but peace in the light of tyranny and subjugation is worse.
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