Next time you read someone pontificating that the Roman Empire fell because it did something he doesn't approve of, just smile.
The Roman Empire fell because it did something the author doesn't approve of. And the American Empire or Putin's Russia or Communist China will fall because they also do what the author dislikes. It's a fun trope and you see it all the time. It's easy to do and lets the author pretend to be the edjamakated sort of fellow who can use Pompey, Pluto and Plato in a sentence rather than a hack re-wording the latest instructions from the Military-Industrial-Media-Complex.