[Kiowa Warrior]

At the moment I don't think that Locke's displays of anger are anything to really worry about because, as SP has said, Locke is normally such a calm, thoughtful and laid back person, that when he does lose his temper it's quite shocking. Jack for instance lets rip (both physically and verbally) practically every episode, but that's not made a huge deal about because that's the way his character and personality is. Everyone loses their temper at times, and given Locke's history and current state of circumstances on the island I'd be more worried if he never displayed any show of anger or frustration. I also think that Locke's one-off, impulsive shows of physical anger (like smacking Charlie one) are a lot more justifiable than the planned, pre-meditated displays of torture and violence we've seen other characters concoct.