"The argumentum ad fireballum fallacy holds strong, I assume?
The ways power is acquired and exercised don't change just because monsters exist. In fact, monsters were believed to exist for most of humanity's history. And the ways of power are what they are exactly as a result of said history!"
Think about it, people. Our ancestors believed in magic. They knew faeries existed. They didn't doubt the power of faith, nor the power of devils and demons. What does it matter that they didn't actually exist? A basic lesson in policymaking is that people react not to what is, but to what they believe is!
And yet, they had developed intricate forms of government, and power was still acquired by political actions (even when they involved swords).
There were some people who put the beliefs of the time to the service of their political ambitions. But none of them managed anything without playing the political game.