I do not know of this show. Is it pure fiction?
No, it's for real - or at least that's how it was presented. Derren Brown is a "mentalist" (hypnotist/magician) who uses various types of psychological trickery to mess with people's heads for the viewer's amusement - making taxi drivers forget where to find a major landmark when it's right in front of them, making everyone in a shopping mall simultaneously raise their hand in the air without knowing why, making a room full of atheists suddenly start believing in God, etc.
The effect would just satisfy the brain with stimulation and make him less likely to disbelieve. Later, he would feel that he did research the material well enough (through only the study itself) and he would not try to do supplimental research.
I think you're right. It also creates the illusion of an open discussion where all sides of the issue were considered and up for debate. We discussed that point, and that was the conclusion we all came to - everyone else's comment was in agreement with the paragraph, so I must be the odd one out for seeing a problem.