2) They understand that the painted faces allow the savages to do things Jack and the hunters would not ordinarily do: “the liberation into savagery that the concealing paint brought. “
3) Roger, the character least able to understand the civilizing impulse, crushes the conch shell as he looses the boulder and kills Piggy, the character least able to understand the savage impulse.
4) Piggy dies when the dislodged rock knocks him over the side of the cliff. Rather than feeling guilty about Piggy’s death, it seems to make the savages even more bloodthirsty.
5) Sam and Eric join the hunters because they were literally being tortured by Roger and Jack.
6) He is the tribal executioner and he relishes his job. Additionally, he has “only just” missed pushing Jack, which indicates a potential future power struggle, were they to remain in the island much longer.