Why does Golding include the passage about Henry Percival and johnny?

Golding includes the passage about Henry Percival and Johnny to illustrate the innocence and complexity of childhood amidst the chaos of their environment. This interaction highlights the boys' struggle between their innate moral instincts and the influence of their increasingly savage surroundings. It serves to emphasize the theme of lost innocence, as even simple play can be tainted by the darker aspects of human nature that emerge on the island. Ultimately, this moment underscores the tension between civilization and savagery in the novel.