I'm not sure that people who have been posting on here understand the nature of mental illness. I think everything that is happening to David is consistent with depressive paranoia brought on by the traumas he's suffered in his life. Of course some of these things have affected Sarah too, but not everyone reacts in the same way.
I think both the storyline and Jack Shepherd's depiction are spot on. He is a bright boy who could easily get an A* in one subject. And as for driving his car in to the canal without being stopped, I don't really see much wrong with that either. 16 year old kids are going out joy riding all the time without getting stopped for a long time.
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