Yep, the Romans were so weak that they conquered the entire Mediterranean world. Greece and Rome were so weak that they were the first to have the idea that absolute rule should not be in the form of one man derived from supreme military power, but instead invented the concept of Democracy and a Republic.
The weakness of Western Civilization is because it came from Greece and Rome. Sure. That is a good one! What culture and government system do you think would be a better one to base Western Civilization upon?