You're implying Golding based it on experience on how unsupervised children really behave, but in fact he made it all up. Now (well, 60 years ago) that he has been debunked, we should accept the evidence, not invent arbitrary reasons why it doesn't apply. Especially since the boys in question were "Sione, Stephen, Kolo, David, Luke and Mano – all pupils at a strict Catholic boarding school in Nuku‘alofa."
You're implying Golding based it on experience on how unsupervised children really behave, but in fact he made it all up. Now (well, 60 years ago) that he has been debunked, we should accept the evidence, not invent arbitrary reasons why it doesn't apply. Especially since the boys in question were "Sione, Stephen, Kolo, David, Luke and Mano – all pupils at a strict Catholic boarding school in Nuku‘alofa."