It's mean to abandon someone who needs guidance.
Jack's student, Jenny, has told Jack that her parents who are alcoholics and neglect her.
Jack wants to be the best teacher possible.
Jack calls CPS and reports Jenny's parents of abuse.
Jack decides to ignore Jenny's problem because he doesn't want to break up the family or become legally liable.
Jenny ends up being taken away from her parents.
Jenny's grades fall as she sinks into depression.