How does Jack maintain control of his group?

Jack maintains his authority by capitalizing on the fears and suspicions of the others. Even when presented with information that the figure on the mountain is not harmful, Jack continues to promote fear of the dreaded beast. Like many tyrants, his rules are based on a strict distinction between insiders and outsiders: the insiders are his tribe, and the outsiders are their common enemies: the beast and the boys on the island who reject Jack's authority. His methods of rule are entirely exclusionary, and they fail to provide that first role of government, the security and the safety of the group, even while Jack purports to be able to provide protection from the beast and other enemies.