Why might an author use anthropomorphism to tell a story? Why might it be an advantage for an author to use people characters and tell a story in a fable or allegorical form?

The biggest example of this is the beast and anthropomorphism. The pig's head represents the devil and takes on the tone of a schoolmaster. This provides the symbolism and Metaphor for Simon (Christ figure) to face his own fears.

“You are a silly little boy,” said the Lord of the Flies, “just an ignorant, silly little boy.”