In Lord of the Flies, quotes in chapter 3 that demonstrate how the boys have lost their innocence include a comparison to Jack as an ape, which makes him seem savage and animalistic, traits that the reader understands will emerge as the novel progresses:
And for a minute, he became less a hunter than a furtive thing, ape-like among the tangle of trees.
Moreover, it is too early in the book for Ralph to have a full understanding of the internal savagery that Jack and his hunters unleash, but at this point he has begun to understand the mechanics of trying to govern an unwilling group of boys. He has come to recognize the political frustration that his elders back in England probably often felt, saying,
Meetings. Don’t we love meetings? Every day. Twice a day. We talk.
The implication is that the talk rarely leads to change or action, and Ralph is beginning to get frustrated. He has lost his political innocence. Ralph is upset because so few boys are willing to help construct the shelters and other essentials that the boys need to survive until they are rescued. Jack feels that he and his hunters do not need to help with anything other than finding meat to feed them. While this antagonism between the two boys represents the power struggle between them, it also shows underlying divisions that are present back home among people who prioritize one thing over another and cannot or will not willingly try to understand why another group places priorities on different things.
Ralph is beginning to resent how much of the unpleasant workload falls on his shoulders. When Jack points out that he and the hunters will provide a much needed service by getting food for the boys, Ralph says to Jack,
“But you like it!” shouted Ralph. “You want to hunt.”
Ralph understands that Jack does as he pleases while Ralph undertakes the work, even though he does not enjoy it, because he is toiling for the good of the entire community. In this way, Ralph is civic minded, while Jack is only serving his own growing lust for violence and hunt. Ralph has lost his innocence regarding human nature.