God did give authority of pagans to rule over the lands of His people. The Lord can also grant insane people authority to rule over people as a punishment. If people in North Korea follow a criminal minded man in as much as the German's did Hitler, then God grants them in their democratic fellowship to get the king they want. Just as His people wanted king Saul. 

So, yes, God has the power to lend authority to really bad people as a sign of punishment.

If you read the Book of Daniel, and how Saint Michael was contending with the Prince of Persia. 

Even the pagan Roman world was granted by God to rule over His people: rendering to Caesar

The Christian faithful witness was building Catacombs, but not obstructing Roman law. Escaping persecution when they could, but willing to never go back to the Roman Pagan world: St. Felicity nd St. Perpetua

The U.S. flag does not embellish nor symbolizes anything criminal. Thus, it does not represent an inherent wrong by whoever is in charge.