... and yet, population declined, the Empire collapsed, and nobody raised their hands for its defence, while those dirty ('dark') medieval societies evolved into modernity...Before the end of the Roman Empire it was a globalized world with a market and diversified urban economy with precise laws, widespread infrastructure which you wouldn't see the like of until the modern era, widespread public sanitation, a complex form of government, a highly educated and competent class of bureaucrats to rule, extensive professional and standing armies with standardized equipment and logistics which wouldn't have parallels in the Middle Ages, and a much higher degree of urbanization.
I just aim to suggest that what we consider superior is sometimes rotten inside.