While it may be a challenge to comprehend Jack's actions, it should be noted that, at least initially, his intentions were to secure food. It's over time that his initial attempts become perverted as he becomes more obsessed with the whole idea of garnering power all for the wrong reasons. From the outside, it can be difficult to comprehend that, as human beings, we could be capable of such brutality. Can it be that I'm capable of such behavior? One cannot know unless we ourselves are subjected to such deprivation. I cannot comprehend such behavior, but I've (thankfully) never been in a position to comtemplate such behavior. It would be one thing to believe that we would act in a manner which would be consisten with the way we live our present lives. Such may not be the case if the circumstances were more in line with those experienced by those on the island. One of the more important aspects of Lord of the Flies is that the story askes us questions that we wouldn't normally consider.