The darkness inside human nature
Golding's central argument is that evil is not imposed from outside — it lives in people. The island removes all external authority, and what emerges is not freedom but violence. Every boy on the island carries the beast inside him.
Order versus savagery
Ralph and Jack represent two competing ways of organizing people: rational rules versus primal excitement. The novel tracks how Jack's approach wins not because it's better but because it's more emotionally satisfying. Order requires discipline; savagery feels good.
The failure of democracy and reason
The conch and Piggy represent democratic process and rational thinking. Both are destroyed. Golding shows that reason and fair process are not self-sustaining — they depend on people choosing to respect them, and most people stop choosing that when fear takes over.
Fear as a tool of control
The beast starts as a nightmare and becomes a political weapon. Jack uses the boys' fear to consolidate power, offering protection in exchange for obedience. The novel shows how manufactured fear can make people surrender freedom willingly.
Loss of innocence
The boys arrive as schoolchildren and leave — or die — as killers. Ralph's final breakdown on the beach is a mourning for what has been permanently lost. Golding refuses to let the naval officer's arrival feel like a restoration of innocence; it's too late for that.