I didn't say you have to be evil to be a killer. And I was simply saying that if you look at it from Jack's perspective you can understand why he pulled the trigger. I don't think this makes him a 'killer' as the word is used in this thread it seems like it means 'murderer'. I don't agree that he is gravitating toward being a violent person or that he is going to start killing people. I think he will do what he has to do to survive and protect the other Losties. There is a difference. But once he is on that path, can he get off? Soldiers kill during war but they manage to get off that path. And people don't call them 'killers'.