Why is there an odd use of question marks in Lord of the Flies?

Question

During Simon's encounter with the Lord of the Flies, the Lord of the Flies says:

“You knew, didn’t you? I’m part of you? Close, close, close! I’m the reason why it’s no go? Why things are what they are?”

I understand the general idea of the sentence, that Simon is the only one who realizes that the Beast is inside the boys, but why are there so many question marks? It makes sense for "You knew, didn't you?", but for "I'm part of you?", "I'm the reason why it's no go?", and "Why things are what they are?" it seems odd.

Does anyone have an idea as to why Golding included these?

Answer 1

With appropriate vocal inflection, any statement can be turned into a question. Typically, this would have been done by ending with a rising vocal pitch, rather than a falling one. So he is asking the listener whether they agree with a series of statements, in an attempt to conciliate them.

Answer 2

Speaking with a rising inflection or turning everything into a question is known as uptalk or upspeech or, to get technical, high rising terminal.

To some people, it projects uncertainty, but according to some researchers, there is a conversational purpose to it as well:

it invites the listener to listen actively, to nod or confirm, much like adding “you know?” or “right?” to a sentence. It also serves a more basic function of “floor-holding,” preventing interruption by indicating there’s more to come; it turns a period into a semicolon.

In a normal conversation, it would seem that the speaker is trying to elicit agreement from the listener. In this case, however, the speaker is a hallucination of the listener, so Simon has no choice but to agree.