Answer:
He does not blow into the conch because throughout the book, the conch is a symbol for law and order, but the law and order is slowly starting to fade away from it, and he fears that if he blows into the conch no one will respond and all of the chaos that they are having would remain.
Explanation:
Ralph also won't let Piggy blow into it because Ralph is the leader of the island, and as I stated earlier, the conch symbolized law and order.
