unjust rulers

 In Psalm 59 we read:

1 Do you rulers indeed speak justly?

    Do you judge people with equity?

2 No, in your heart you devise injustice,

    and your hands mete out violence on the earth.

Is there any correlation between morale and lust for power? I think so: the more corrupt a person is, the more he craves power. As a teacher, I saw that in general, bad students with questionable character want to represent the class, even if they don't earn money for it. It seems to me that people of good character rarely run for election.

Despite such problems, in Romans 13 we read:

13 1 Let everyone be subject to the governing authorities, for there is no authority except that which God has established. The authorities that exist have been established by God.

Paul exhorts Christians to submit to rulers, but Psalm 59 ends with the righteous rejoicing when avenged:

11 Then people will say, “Surely the righteous still are rewarded;  surely there is a God who judges the earth.”

Unjust rulers will get what they deserve.

How should Christians submit to unjust rulers? Was it right for early American settlers to rebel against England? How should a Christian submit to a bad boss?

I really don't know the answers. May the Lord give me wisdom to analyze and take the right actions in each circumstance.