Quote:
Roger, the character least able to understand the civilizing impulse, crushes the conch shell as he looses the boulder and kills Piggy, the character least able to understand the savage impulse. As we see in the next chapter, Ralph, the boy most closely associated with civilization and order, destroys the Lord of the Flies, the governing totem of the dark impulses within each individual.
However, I am not sure if (or what kind) Golding was trying to establish a connection between Piggy and the pig's head as Lord of the Flies.