In Lord of the Flies, why does the conch die with Piggy?
In my opinion, this is because when Piggy and the conch both die, civilization and order have died along with them.
As you know, the conch is a symbol of civilization and order on the island. It is used for calling meetings and it is used so the boys can have an orderly way to define who should talk. These are civilized things.
When the hunters kill Piggy on purpose, they are finally and completely cutting off their ties with civilization. Therefore, it is appropriate that the symbol of civilization should die too.