Jack and his tribe.
Roger and Maurice are the ones that attack Jack and Piggy because Jack wants Piggy's glasses.
Piggy is fully aware that Ralph is the only thing that is preventing Jack from becoming chief. Piggy knows that if Jack does become chief all hope of rescue will disappear because Jack will only bother about hunting and the signal fire wil be forgotten. Piggy is also fearful for his own safety.
In spite of his dislike of physical exercise Piggy offered to go on the expedition to climb the mountain along with Ralph, Simon and Jack. However Ralph declined his offer. Piggy reminded the three boys, and I quote.. "I was with him when he found the conch. I was with him before anyone else was." Piggy wants to remain at the focus of things, alongside Ralph, and is fearful of being excluded in favour of Jack and Simon.
Ralph and Piggy join in Jack his tribe's dance during the night when Simon came out of the forest. Jack and everybody else thought he was the beastie (since it was so dark) and they killed him.
Well, when Ralph is hallucinating he talks to the lord if the flies. While talking to it, it tells him "or else we shall do you? See? Jack and Roger and Maurice and Robert and Bill and Piggy and Ralph. Do you. See?." Meaning that all those people he just named will partake in Simon's death. Which, they did in chapter 9 during the ritual we he stuccoed down from the mountain.
because he feels that keeping the fire going is far more important than hunting. Jack has the desire to rule and Ralph stands in his way. Jack, even in the beginning of the book, Jack wants to be chief. He nominates himself but is rejected as their leader in favor of Ralph, which sparks the flame of hate. Ralph does stand in his way but it's more that Ralph, for no honestly valid reason, was picked instead of Jack. On the mountain when they saw the Beast (the parachuter, in actuality), Ralph stops, leading Jack further to believe that Ralph is a coward and doesn't deserve to be chief. He sees it as unfair, which angers him and makes him hate Ralph for getting what probably seems like benefits when he "hasn't earned them." Later, even when Ralph begins to lose power and Jack proposes that he replace the "chief", he is still rejected. This brings him to tears and angers him so much that he decided to make his own separate community. Even then, others still chose to stay with Ralph. No matter how hard Jack tried, Ralph always seemed to be more able to win others over, leaving Jack with very little power, especially compared to his position at the very beginning of the book as leader of the choir boys. He was always obeyed by them, and didn't like the change. Essentially, he hated Ralph because he saw the position Ralph had as undeserved and unfair. It felt to him like he'd been stripped of his position and replaced with someone who he thought was less capable. It made him hate Ralph.
Roger clearly committed Piggy's murder, and Simon's was a group effort. Ralph even admits to being part of the group. The only boy Jack had murderous intentions toward was Ralph, and he didn't even kill him.Another answer: You could point out that the death of Simon was as the result of an attack by all of the boys who simply mistook him for the beast. Jack did not attack Simon by himself and he certainly didn't order anyone else to do it. You could also point out that Roger pushed against the lever, that caused the boulder to drop from the top of castle rock and knock Piggy from the causeway. Jack was nowhere near Roger and he didn't tell him to do it.However you could also point out that Jack was indirectly responsible for both deaths. If Jack hadn't been so obsessed with being leader and hunting there would have been no feast on the beach. It was Jack who told the boys to 'do our dance' when the storm began to break. Because of Jack the boys were over excited and already involved in a pig killing dance when Simon stumbled out of the jungle. Similarly if Jack hadn't left the main group to form his own tribe, based at castle rock, none of the boys would have been there. Jack had placed Roger on guard and in control of the boulder. After Piggy was killed Jack actually claimed responsibility by say "I mean't that!" Jack had shown by his own actions that he wasn't concerned about rules or about using violence. His very manner of leadership had given encouragement to Roger's disturbed sadistic inclinations.
Ralph complains about a number of things to Jack but primarily the lack of any help to build the shelters. Quoting directly from the book, here are some example of what Ralph said... "Do you remember the meeting? How everyone was going to work hard until the shelters were finished? All day I've been working with Simon. No one else. They're off bathing, or eating, or playing..."
Piggy is very fat and shorter than Ralph, he wears thick spectacles and suffers from asthma. He uses his asthma as an excuse not to exert himself physically. Piggy is lazy. Piggy is fairly intelligent but not as intelligent as he thinks he is. He is rather intolerant of anyone else expressing an opinion which differs from his own. Piggy's appearance and manner of speaking marks him as a social outcast and the fact that he talks and acts like an adult only serves to alienate him even further from the other boys. Ralph is pretty tall and well built for his age, he apparently has an attractive appearance and he is a good swimmer. He is friendly, fair and shows some consideration for others. Ralph leads by example and tries to do so with the approval of the other boys. He seems to prefer to discus things and persuade the others rather than to simply order them to to do things, as Jack would do. Ralph seems to suffer from Petit Mal epilepsy which may be why he often loses track of what he is saying.
To quote from the book... 'And in the middle of them, with filthy body, matted hair, and unwiped nose, Ralph wept for the end of innocence, the darkness of man's heart, and the fall through the air of the true, wise friend called Piggy.' When Ralph arrived at the island he was an optimistic boy who believed that his father would soon come and rescue him and that in the meantime he'd have fun on the 'good island' on which he had found himself. Ralph judged the other boys by his own honest, fair and friendly standards and over the course of the story he was forced to revise his judgment. At the end of the book Ralph had found from bitter experience that some people are not fair, honest and good. At the cost of his innocence he had taken part in a 'dance' which had resulted in the violent killing of Simon. Ralph had also witnessed the death of Piggy and had only then realised that the boy, whose real name he'd never even bothered to find out, had actually been his friend. The happy world of feeding ponies and reading books safely in bed had gone for ever and Ralph knew that for the rest of his life he'd have to live with that knowledge.
Everybody helped with the construction of the first hut. But then the enthusiasm died down and it was only Ralph and Simon that would build the shelters. Simon also wandered off for long periods of time in the forest. Piggy never helped because he had asthma, which the boys called "ass-mar". The littluns just played and swam all day. Jack and his Hunters were too busy hunting or watching the signal fire.
Piggy uses his asthma as an excuse not to do any physical work, so you could, perhaps, accuse him of being lazy. Piggy can also be a more than a little tactless, particularly when he is annoyed, as he was with Jack when the fire went out. This tactlessness, especially with someone as volatile and aggressive as Jack isn't a particularly sensible strategy. Piggy is also more than a little big headed. He is convinced that he is the 'intelligent one' and doesn't take lightly to anyone else, such as Simon, voicing ideas which don't agree with his own.