Should Sam and Eric be considered guilty or innocent for their actions on the island in Lord of the Flies?

I would argue that Samneric should generally be regarded as innocent. They're among the weaker members of the group, timid little creatures precluded by size and age from influencing the course of events. They're bit players in a much bigger drama in which they're hopelessly out of their depth; they are pawns in a deadly power struggle between Ralph and Jack.
It's notable that Samneric are described as "dim shadows." This highlights their subordinate status on the island as well as foreshadows their betrayal of Ralph. Although Ralph implores the twins to keep his hiding place a secret, they confess his whereabouts to the savages, putting his life in imminent danger. Yet it's difficult to see what else they could've done under the circumstances. They were being brutally tortured by the sadistic Roger, so they didn't have much choice in the matter. Besides, having seen what had happened to Piggy, the boys were justifiably worried that they'd be next.