I don't see anything wrong with the fine. I think the parent's should somehow make the teens pay. Earning the money, community service, etc.
From Michael Berg:
Every person has a unique connection to the Creator that can never be extinguished, and every person has a great soul that can manifest important things in our world. To make a person feel less than they are because of something inside themselves, be it faith, race, or sexual orientation, is the greatest sin of all."