The Chocolate War

I am often asked by students why Cormier chooses to end The Chocolate War the way he does. Several have been disturbed that Jerry goes through everything he does, only to regret his actions in the end. What do you think Cormier's purpose is, other than not giving us a happy ending? Couldn't he at least have given some hope that Jerry felt his struggle was worth it in some way?

I hope you people konw that there is a second one...