Folly inhibits human development
What if politicians united and got rid of any political aggressor? Each state would sign a relevant accord and establish special troops that fall under the authority of, say, the International Peace and Democracy Council. Once a dictatorship surfaces, it is killed in the bud. Once a country invades another, and such a thing can no longer be kept secret, its membership is immediately terminated. The question remains whether foolish politicians will ever set their hand to such a wise accord.