As the boys start to build civilization, Ralph faces the fact that not everybody is bound to obey the rules and morals of society. Even though there is the presence of the conch (a symbol of power and authority), humans can be driven away to more meaningless tasks, stating the obvious struggles to build up civilization.
SAVAGERY VS CIVILIZATION
By coming together as a mob, the hunters show a brutal killing of an innocent animal as something thrilling and invigorating. The mob mentality sometimes even succeeds in making civilization put up a mask and act savagely.
LOSS OF INNOCENCE
The scene of civilization (Ralph) enjoying a brutal reenactment of hunting, shows that no matter how deeply anyone is rooted in moral values, evil always remains in them. However, Simon shows the readers that when one has innate goodness, there are possibilities of resisting evil.
WAR AND THE FUTURE OF MANKIND
The two natural instincts of being a moral person or being a complete savage is always at war with each other. Whilst one may have no interest in savagery altogether, another may not understand the importance of morality, causing both instincts to always trying to be superior than the other.
The moment humans entered the island, they destroyed a part of it and continued doing the same until even the most peaceful part of the island (Simon's hideout) was a victim of natural evil. The thoughts of the boys were scarred by the happenings on the island and they lost their innocence of not knowing true human nature.
No matter the amount of attempts and initiatives took to establish civilization, the boys fell into savagery just like the world beyond the island where the whole world was fighting for power and authority. The island Golding presented is just a reflection of the whole world at is truest form.