On the killing thing, he shot Anna Lucia, and then accidentially shot Libby. There's nothing really out of the picture of good eliminating evil.
The only one that hasen't really sinned is Locke, and he kinda represents Christ coming off of the cross (Wheelchair) and walking in the land of sinners.
I also wouldn't be surprised if this others leader that they keep talking about who's so brilliant is the doctor from the mental ward that Hurley came from.
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