"Only the dead have seen the end of war." Plato
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And then if they do anyway, to take it to them so harshly as to make an impression in their, their childrens, their grandchildrens, and their great grandchildren's minds down to the 6th generation that it was a mistake to do so.
Then, once they are sufficently humbled, to help them stand back up and take on republican, constitutional, moral principlas of liberty themselves.