No one has ever argued that it is man's purpose to dominate other men as God created us. It is simply one of many actions that He has ordained. God was against the idea of kings, but He clearly sanctioned the idea of leadership.
Your third sentence is very interesting; you are saying that we determine with our choices whether authority is from God. I believe that God determines exclusively on whom will rest all authority on earth. How does your model work? I assume you would agree that God does not give the power to dominate to everyone. Does God then grant authority to some with His blessing, and then if it is misused He yanks it back as if it were never given?
"The LORD said to Samuel, "Listen to the voice of the people in regard to all that they say to you, for they have not rejected you, but they have rejected Me from being king over them." [1 Sam 8:7]
Samuel was in God's favor when He said this, right? God told him to listen to the people. Isn't that exactly what Pilate did? Doesn't this verse actually support the contention that Pilate's actions were God's will?
If the power of Pilate was that of God, Christ would have obeyed it. Instead, He made it clear that Pilate had no power over Him.
What? Christ said that Pilate had no power over Him EXCEPT what was given from above. Pilate ordered crucifixion. Did Christ "obey" or "disobey"? Christ Himself said He could have summoned quite a posse in His defense, but He didn't. Therefore, since Christ so "unnecessarily" went through with it, isn't that proof positive that Pilate's power was from God and in accordance with His will?
How does it work? It works like the talents work. If we do good with His blessings in His name, then the talents He gave us are morally just. If we use them for our own profit and evil deeds, then God's blessings are suqandered and morally void.
The power, like the freedom, is given to the righteous and the unrighteous; what we do with these blessings is what makes them of God or evil.
Christ did "obey" because that was the Plan, a necessary step and out of l;ove for mankind; not out of respect for Pilate's sinnful application of God's blessings.