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.
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Jack is not guilty for piggy's death. The reason for this is that roger was the one in charged with the rock. Roger through the rock at piggy. Jack is also not guilty for simon's death. The reason for this is that it was dark and nobody couldn't see nothing but they could of seen something running tourers them. They thought it was the beast so they attacked. They also build up so much fear that they weren't really thinking about the affects of there action.
no.
At page42, Simon commented on Piggy. "We used his specs, he helped that way." shows that Simon see the best out of people.
sup
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.
Piggy