Definitely nailed it on the head. And wow, so many topics about Trent going on. That can't be good for him. But anyway, it's all basically what OrSoIThought said. Trent didn't mean to harm anyone, he was just stressed. In spite of him coming clean about his #9 obsession, Trent was mostly worried about Gwen and even though it's not safe to say that that's what caused his OCD, I still say that it's part of it, like about half the reason why Trent did what he did. Ever since Chris came up with the idea of him and Gwen competing against each other, Trent felt threatened- afraid that the idea that everything would go wrong and ruin his relationship with Gwen. Not only that, but Trent pretty much got neglected the whole time being there. He saw Gwen and Duncan together and came up with the idea that while he and Gwen were on separate teams, Duncan had a better chance of getting close to her that way. So all in all, Trent just had a lot on his mind. Pretty much what he did was all an accident- not really intentional in any way.
Harold would have to be the bigger traitor, but I can't say that blame him. He's been through a lot- going back and forth between Duncan and Courtney constantly picking on, criticizing him- telling him how gross he is, so of course he's bound to do something sooner or later, those two were driving the guy nuts. As much as I don't like Harold, I really can't stand Courtney. I mean she had-and still has- to be like one of the most annoying characters; getting upset and penalizing innocent people for no reason and if you're wondering why Harold voted Courtney off to get to Duncan, Harold pretty much had a brilliant strategy. Rather than just voting Duncan off to get a simple revenge, he voted out someone he cared about to cause him pain and maybe lose focus in future challenges. It didn't exactly work, but it did have an impact on Duncan, so I'd say that it paid off. I'm glad Harold did what he did. Maybe it'll show that ridiculous "Courtney" that she's not meant to have everything her way. Harold stood up for himself and he didn't show Duncan that he was someone to take advantage of. He was smart, cunning and downright assertive. I liked what Harold did. If anything, I admire(d) it.