Why do the boys insist on following jack in lord of the flies chapter 9?

Ralph suggests a signal fire, building shelters, collecting water and using the rocks as a toilet as aids to the boys survival. Jack has only one suggestion; to hunt pigs for meat. While this might be a reasonable objective the fact is that the boys seemingly have an adequate supply of fruit, fish and crabs to eat and the meat is hardly worth the disproportionate amount of effort which Jack and his hunters put into procuring it. The reality is simply that Jack doesn't hunt pigs for meat to benefit the rest of the boys. Jack hunts pigs because he wants to kill them.