“Yes. Mankind can’t endure the thought that the world was born by chance, by mistake, just because four brainless atoms bumped into one another on a slippery highway. So a cosmic plot has to be found—God, angels, devils. Synarchy performs the same function on a lesser scale.”
It is the fundamental explanation for a lot of the characters' actions in the book, the desire to look outside for simplicity. I think a lot of our political dilemmas, contemporary and Fascism in 1940s Italy can be traced to this.