Ice, as I understand it, you haven't watched from the beginning of the show. Yes, if you were to pick it up from the death, I believe you would see it differently, but there's something incredibly odd about Locke that I can't quite put a finger on. This has been apparent since his flashback episode, maybe even prior to it. Here we've got a very lonely individual who has found a source of power that has given him so much and the people who he has been blessed to be around are trying to take that away from him. It appears to me that he's playing a game with them to manipulate them in a way that will allow him to get what he wants out of the island and these people. This is apparent when he took both Charlie and Boone under his wing... Only the difference there is, Charlie drops his drug habit and Boone is killed. Locke makes his first, and possibly last mistaker of letting Boone climb that cliff. I think, since that happens, he has to decide between the island or his fellow castaways. It'll be interesting to see which way he swings.