If the island does need to 'feed' on the dead, then maybe the people who are having visions like personal assassins or protectors for it. I don't think Locke meant to kill Boone, or Ana meant to kill Shannon, and I can't see how those to were considered dangers to the island, but Locke's involvement in Naomi's death is a different story. He killed her to protect the secrecy of the island. Sorry if this doesn't make sense I don't think I've phrased my point too well.
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