Why have a composer create a beautiful, original score for your film if
...you're going to randomly reuse one of his most famous pieces from a score he did for another film three or four years earlier? Tiersen created themes for this film ("Summer '78", "From Prison to Hospital") that were just as memorable, if not more than, his pieces for Amelie. Why take away from your own film as a whole and the composer's originality by recycling a theme done for an unrelated film?
"That takes a fourteen-shot clip. You expectin' an army?"
"No, just a division."