Forgive me, but I feel I'm not expressing myself clearly.
The following facts are assumed:
- Rocks attack vessels approaching the island.
- Birds will cause superficial injury to individuals on or approaching the Island.
- Individuals die or go missing on the island.
- There is some sort of entity on the island.
Given these facts, a lost, confused seaman, likely suffering from hunger, thirst and sleep deprivation, has come to the conclusion that the birds are there explicitly to protect humans.
Given the same facts, I, as a reader, do not infer the same thing. My reading of this SCP gives me a different impression of it's purpose than the impressions of characters in it. Although this, in and of itself, is not necessarily a bad thing, for me it doesn't work in this instance.