Doesn't this presuppose that all rulers are of good character, which we know isn't true?

Doesn't this presuppose that all rulers are of good character, which we know isn't true?  In fact doesn't it go against one of the central messages of Scripture?  That message being that the human race is a fallen race.  That we are all sinners bound for hell without the saving grace of God through Jesus. 

Romans 13:1-4(NKJV)

Let every soul be subject to the governing authorities. For there is no authority except from God, and the authorities that exist are appointed by God. 

Therefore whoever resists the authority resists the ordinance of God, and those who resist will bring judgment on themselves. 

For rulers are not a terror to good works, but to evil. Do you want to be unafraid of the authority? Do what is good, and you will have praise from the same. 

For he is God’s minister to you for good. But if you do evil, be afraid; for he does not bear the sword in vain; for he is God’s minister, an avenger to execute wrath on him who practices evil.

Really?  All rulers are put here and appointed by God?  Hitler?  Pol Pot?  Stalin?

Now let's look at the Romans passage in light of this passage from John.

John 3:18-21(NKJV)

“He who believes in Him is not condemned; but he who does not believe is condemned already, because he has not believed in the name of the only begotten Son of God. 

And this is the condemnation, that the light has come into the world, and men loved darkness rather than light, because their deeds were evil. 

For everyone practicing evil hates the light and does not come to the light, lest his deeds should be exposed. 

But he who does the truth comes to the light, that his deeds may be clearly seen, that they have been done in God.”

Now if we were to reframe the Romans passage to understand that Paul was referring to "Godly leaders" and not all leaders that would make sense.   But unfortunately the text doesn't say that.  I guess this is an area where we have to let our discernment through the Holy Spirit guide us.

Something to ponder.