I didn't disagree.
The disagreement stemmed from your presentation that God would perfect (existing institution) when I showed that they will be obliterated at Armageddon.
Now you're fighting with John. The fact is, God will purify and redeem the nations. There is not a hint anywhere in Scripture, Old or New Testament stating he will completely "obliterate" the nations. Just as the nation of Israel, the gentle nations hang around all the way to the end.
Here are all the final passages regarding the nations in Revelation. Read them for yourself and ask yourself if the nations will be completely obliterated.
Rev. 19:15 Coming out of his mouth is a sharp sword with which to strike down the nations. “He will rule them with an iron scepter.” He treads the winepress of the fury of the wrath of God Almighty.
Rev. 20:3 He threw him into the Abyss, and locked and sealed it over him, to keep him from deceiving the nations anymore until the thousand years were ended. After that, he must be set free for a short time.
Rev. 20:8 and will go out to deceive the nations in the four corners of the earth—Gog and Magog—and to gather them for battle. In number they are like the sand on the seashore.
Rev. 21:24 The nations will walk by its light, and the kings of the earth will bring their splendor into it.
Rev. 21:26 The glory and honor of the nations will be brought into it.
Rev. 22:2 down the middle of the great street of the city. On each side of the river stood the tree of life, bearing twelve crops of fruit, yielding its fruit every month. And the leaves of the tree are for the healing of the nations.
Unless you think that "the authorities that exist are appointed by God" means they are good and in some manner righteous, then that passage does not disarm my original statement.
Yeah, I do believe it forces you away from you original stance that governments and nations are condemned and unable to do anything good. Governments from the time of Babel are from God, and to be honored and respected. They are specifically called "ministers of God." The fact is, government is a good institution put in place by God for our benefit. They can become corrupt, and God has judged them in the past and present. But generally speaking, Paul is correct, they are God's ministers. To say otherwise is to deny Scripture.
Paul referred to himself as a Roman citizen and appealed to its authority. Makes sense in light of Romans 13.