Augustine’s argument about what really brought Rome down could be spoken of today’s world power:
Well may they scoff, utter scamps and railers as they are, far from truebred sons of those very Romans even, who have to their credit many glorious feats for which they are honoured in the book of history. Nay, they are headlong foes to the renown of their ancestors. Truly they had made the name of Rome, that Rome that was conceived and nourished by the pains of their elders, sink lower while she stood than ever it sank when she fell, forasmuch as in her fall were overturned but stones and timbers, while in their way of living were overturned all the ramparts and splendours, not of mural, but of moral strength. Deadlier were the lusts that raged in their hearts than the flames that raged in their city’s edifices.
-Augustine, City of God, 2.2 (LCL 411.151).