I think the process of Jack's take over of the position of chief in chapter 8 is fascinating and chilling at the same time. The boys still want Ralph to be in charge, but Ralph does not step up to the plate. Oh! sorry about the bad cliche'. Ralph does not realize how his power is waning. He needs to find a new plan. Ralph still thinks there is power in the conch. He and Piggy are surprised that Jack doesn't go for the conch when he and his henchboys go for the fire.
The conch no long has power because Jack doesn't want order and democracy. Jack is a dictator. He takes what he wants by force.
Jack finally gives the boys a choice. Go with him and have meat and excitement and protection from the beast or stay with Ralph and work hard building shelters and keeping stupid signal fires going.
The boys do not openly show their support for Jack because they are not totally ready to show their mutinous hearts in front of the assembly- the assembly that represents reason, respect of the individual, democracy, and decency. Ralph just turns around and one by one they desert him. Ralph, for all his good intentions, is not a strong leader. He does not fight to keep the group in tact. Maybe if he was as smart as Piggy, he might have a chance. Piggy is smart, but he is so vulnerable physically. Jack has no fear of Piggy.
As was the case in World War II, strong leadership is what stopped Hitler. Jack is much like Hitler. Strong measures and personal sacrifice were necessary to stop Hitler. Ralph does not see this until it is too late. Jack is a barbarian. Ralph is still trying to appease Jack as the power swings to Jacks side. Bullies must be dealt with seriously, or the consequences can be devastating.