William Golding wrote "Lord of the Flies" with the intention to show the corruption in our society

 He also is the only one who has the courage to disagree with the hierarchy and the leader and criticize them. Another feature of his is that he is idealistic – in the end, only he tries to keep the rules and the significance of the conch. He believes that unity and understanding among the boys would save them: “Which is better, law and rescue, or hunting and breaking things up?”
As mentioned before, Piggy is the only person on the island that acts in an adult like way in this situation. In his words there are reason and skepticism, opposite to the others pointless optimism. He is a productive and practical person – he is the one who suggests using the conch for making an assembly and making a list of names of all of the people on the island. He is always thinking ahead and says, “We got to do something.” while the other boys wander aimlessly. Piggy knows that without leadership nothing would get done, because no one wants to work if everyone thinks someone else will do it. But to have leadership there must be people that follow you and although Piggy gives the most useful ideas from the whole group of boys, nobody listens to them.
In fact, I think that the author chose all this to happen to Piggy because Piggy is the only one who fully realizes the situation the boys are in. In addition, I believe that Jack uses cruelty and violence over Piggy only because he wants to prove his power in front of the others. Jack hates him so much because he realizes that Piggy is the smartest and most intelligent boy on the island and if he makes the smartest boy on the island suffer, he will be the best and only chief on the island. Jack misuses his leadership. Power can be a very strong drug, once it is in possession one does not want to relinquish the control. Thus to stay in control it is possible to do dishonest things. Furthermore, Piggy possesses a power that nobody on the island has – he has his glasses and therefore fire, which only adds to Jack’s jealously and hatred of Piggy
Piggy is concerned for the others like a parent. He reacts to their offenses with patience and dignity just like an adult should do. Even when Jack establishes his own camp, he offers to visit it to check out if something wrong is going on: “To make sure nothing happens.” He tries to be reasonable in his suggestions to Ralph when they are alone with the twins: “That’s what grownups would do.” He tries to act like a parent, but he also needs one to show him the right way and take the important decisions instead of him.
Piggy changes a little throughout the book. For example, in the beginning, he strictly obeys his principles and rules, but later when he is only with Ralph and Samneric, he offers making a feast and says that they can pass without the others while in the beginning he wished unity amongst the boys. Furthermore, he says that Simon is “cracked” even though Simon is the only person who used to get along with Piggy before he was killed by the hunters. Another feature that changes in Piggy is that from the weak-willed boy that “opened his mouth to speak, caught Jack’s eye and shut it again”, he turned into a determined and resolute man who could go to Jack’s camp and tell him in the face what he thinks about him and “daring and indignant” to take the conch.
In conclusion, I would like to say that Piggy’s character is a very deep and sad one because in the same time he arouses our sympathy towards him and makes us think about the problems of our own society and hidden animal instincts that everybody has. He was the symbol of the world of adults and wisdom until his peers’ barbarism leads to his death. You understand how valuable something is only when you lose it irretrievably. I think Ralph’s tribute at the end of the book for his “true and wise friend” is the answer to the question, “Would Piggy have been the best leader for the boys?” Ralph says, “Piggy could think; he could go step by step to a reasonable conclusion; only Piggy was no chief. But Piggy, for all ludicrous body, had brains.”