I believe two views can be proven in Quran.
During the presence of a leader appointed by God, all must come to obey him, and he is a leader whether people obey him or not, a King whether people obey him or not, because God is the True King in all that.
During the absence of a leader, there is no such thing as "authority" or "government" but we must resort to democratic anarchy.
In fact democratic anarchy with sincerity to implement revelation and knowledge, to a degree, is needed even during times of Imams. That is the whole structure must assume no one has true authority until proven with insight. And what is followed with insight, is not really, that of authority taught by people. Even God doesn't want to be followed blindly but he wants people to see the path they are walking and the proofs he advocates.
That is how the light will rule, and it happens to be those who possess the authority, are those who are the witnesses, the lights in the darkness, the doors to God by which we will see.
Authority in other senses of the word, that people actually have the right to govern without proof from God or teach laws without proof from God and informing people with knowledge, much of Quran condemns that.
And the Taghut consisted of many types of leaders in many areas of life, many types of illusions of Iblis to make people take their focus away from the light that is connected to them.
Sometimes there is benefit to the leaders and proofs from God being present, but sometimes it becomes harmful and detrimental to humanity, when the so called followers are not obeying, believing lies attributed to them, and equating their leadership and authority to others who are not appointed by God and really following the latter in the name of following the Imams which is what happened during time of our Imams.
The Quran remains a clarification of all things pertaining to guiding humans. It has all they need, but we must begin to reflect, and build the foundational themes of it, through that everything will become easy.