When the first social group changes because of Jack's deviance and rebellion, the entire society and social norms change with it. Lord of the Flies is a sociological parable that attempts to demonstrate that, in the wrong circumstances, humans are never too far from our innate animal instincts. Instincts that tell us to survive and follow the leader with the most power. This can be interpreted as a worst case scenario, or as an inevitability. It's up to the viewer to interpret who they see in this dystopia.