Some say the fall of rome was due to barbarian invaders. yet its been said that the problem lay in the struggle inside the empire. how did rome fall internally?

The Fall of Rome within its Borders There are many pieces of writing containing facts and inferences about the reasons of the fall of the Roman Empire. After reading selections from a number of writings on this topic, it is somewhat clear what the main reasons for the fall of the Roman Empire were. It was fundamentally due to over taxation, inflation, fear, the sheer size of the empire, and its inability to manage its …

…i am amazed it lasted as long as it did. There were emperors who were totally insane and feared any man who showed the least amount of skill or intelligence in either running an army or running a government. There were generals who marched on rome with their legions, leaving the frontier to defent itself. Slaves worked the empires' farms, factories, and mines. I guess the question really is: Why did it not fall earlier?