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Simple premise, while yes there were a lot of things wrong with the Roman empire the cultural dominance of the militarism and the physical military dominance within the state were one of the biggest aggravates and incentives for needless conquest, civil wars, slavery, and so on... Things that weakened the Roman empire, WRE, and ERE.
This wasn't always the case (although it seems to be since Rome pretty much fought from it's inception). The challenge would be for 3 distinct Roman empires: