Seeing as how Rome lasted a rather long time after the death of Cato the Carthage killer, I'd say that they were doing something right, however childish and naive it may have been. Also I think maybe you could say that one of the things that did Rome in was that they did actually started to accept the survival of external threats in order to fight each other. They were too interested in civil war and neglected the external threats which eventually did them in. That huge new empire wasn't fragile because it was huge, it was fragile because the Romans cut themselves to pieces.
That is easy to say now when political and emotional realities of the time can be easily forgotten. At the time, rather harder to do, especially given the nature of the opposition. Besides, we did end up allowing the Japanese some conditions.
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