About Luther supporting the state and rules rather than the
rightless: he was following the (supposedly inspired) teachings of
St. Paul. From Romans 13:1-2
Obey the government, for God is the one who has put it there.
There is no government anywhere that God has not placed in power.
So those who refuse to obey the laws of the land are refusing to
obey God, and punishment will follow.
Thus, if there's a ruthless king who oppresses the people, God put
the king there to punish the peasants, and the peasants
deserved to be oppressed.
Of course, a lot of people think that the teaching of Jesus and
the teachings of Paul are very much at odds, but pretty much all
Christians of that day believed that the parts of the New
Testament outside of what Jesus said was as directly from God as
what Jesus said.