Why does Maurice walk away when Percival starts crying, and why doesn‟t Roger throw the stones directly at Henry? What does their behavior suggest about human nature?

The episode with Roger and Maurice kicking down the sandcastles signals the disintegration of ordered life on the island, and it foreshadows the end of Ralph's democratic plans. The sandcastles are a miniature civilization on the shore. By destroying the sandcastles, Roger and Maurice not only express an abusive power over the younger boys but indicate their increasing disrespect for civilized order and human institutions. Still, Golding suggests, they have not yet devolved into complete savagery. Maurice, remembering his mother's discipline, feels guilty about kicking sand into Percival's eye, and Roger refrains from throwing a stone at Henry. The implication is that the influences of human society are difficult to erase from the human psyche; they remain internalized even in the absence of rules, and conscience retains its hold. Whatever lessons the boys' past had instilled in them prove critical to maintaining some semblance of peace on the island. Despite the stirrings of anarchy, the boys obey notions of appropriate behavior without any real external authority to determine what they can and cannot do. It is only when the boys completely transgress these civilized norms that they suffer.