Combine becoming fat and lazy and moral decline along with paying others to fight their wars for them led to the fall of the Roman Empire.
Sound familiar?
Don’t forget about massive debt and money printing. Rome’s great economic and political troubles from 235 onward were the result of massive debt and money printing incurred by the Severan Emperors of the late 2nd and first part of 3rd century.
Debt, money printing and currency devaluation to pay for big government, immigrants, bread and circuses and wars? Imagine that?