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 scene with Roger and Maurice kicking down the sandcastles signals the breaking down of requested life on the island, and it anticipates the finish of Ralph's law based plans. The sandcastles are a small scale development on the shore. By devastating the sandcastles, Roger and Maurice not just express a damaging control over the more youthful young men however demonstrate their expanding disregard for edified request and human establishments. In any case, Golding proposes, they have not yet decayed into finish viciousness. Maurice, recollecting his mom's train, feels regretful about kicking sand into Percival's eye, and Roger abstains from tossing a stone at Henry.

Ibelieve the answer is water and oil.