[Slartibartfast]

I think it's a bit of both.

He really doesn't like a lot of people in the house. He sees himself as better at them and looks down on them with disdain. Cos he dislikes them so much, he has no qualms about screwing with them and scheming to get them out. It's good to see such cold gameplaying in the house rather than the usual try to get on with everyone rubbish (that favourite Ant is the master of.)

But he really seems to be relishing his role as the dark deceiver. He orchestrated Science's eviction perfectly, and while I'd have preferred Orlaith to go, you have to be impressed by how Derek has managed to dispacth those housemates he doesn't like. He's partly responsible for the house's attitude towards Orlaith and that she's up for eviction nearly every week.

Derek is the Dark Deceiver, Derek to win!