The issue is that the Roman gods are not unique to Rome, and as with any pagan system, constantly mutated. Anyone with an understanding of classical paganism will know that even if each nation had its own gods, and particular variants of gods, they were always based on earlier sources / civilizations. It's an evolutionary thing. One must suppose that the earliest Roman gods came from Greece or wherever, and there is a pretty good correlation between Greek gods and Roman gods. Greek gods came from the east. Many gods started out in
Sumeria / Bablylon /Eqypt and migrated across to Rome.
So why invoke Roman gods at all? Anyway they are pure paganism.
If you are arguing that Rome did not become ever more corrupt as time went on, that is ridiculous to the extreme. Moreover the gods being imported from the east, such as Cybele etc. became ever more corrupt.
"It is scarcely possible that the eyes of contemporaries should discover in the public felicity the latent causes of decay and corruption. This long peace, and the uniform government of the Romans, introduced a slow and secret poison into the vitals of the empire. The minds of men were gradually reduced to the same level, the fire of genius was extinguished, and even the military spirit evaporated."
Decline and Fall, Gibbon, Chapter 2
Rome believed in conquering the world and in enslavement of the conquered. So did Hitler, not identically but similarly.