Sorry to hear about your car. While I understand your frustration don't be too quick to make judgment. Does the dealership have a policy printed anywhere that states that they may road test your vehicle? This was our policy when I was working at a dealership.
Most techs these days ARE in their 20's. Possibly it was a joyride, however I think you should not judge the dealership so quickly. It will probably get messy now that lawyers are involved, as they are only in it for the $$$$. I hope it all works out for you.