Frank Herbert talks about his creative process in writing the Dune novels:
I conceived of a long novel, the whole trilogy as one book about the messianic convulsions that periodically overtake us. Demagogues, fanatics, con-game artists, the innocent and the not so innocent bystanders?all were to have a part in the drama. This grows from my theory that superheroes are disastrous for humankind. Even if we find a real hero (whatever?or whoever?that may be), eventually fallible mortals take over the power structure that always comes into being around such a leader.
Personal observation has convinced me that in the power area of politics/economics and in their logical consequence, war, people tend to give over every decision-making capacity to any leader who can wrap himself in the myth fabric of the society.