Dewey Finn commits identity theft. Then, after the parents find out about this and are REASONABLY concerned that the school had let Dewey Finn around their children, Dewey Finn KIDNAPS the kids. The cops come, and, along with the parents, they manage to track down Dewey Finn and the children at the rock concert where they are performing.
Dewey Finn is a criminal who should be facing significant jail time. He gets away with his heinous crimes because the PERFORMANCE is good.
This is the greatest plot of all time.
