GPF, I think people are such "cowards" when they mess with someone's property like that. Try to look on the good side, that it was only glass, and you don't need any paint work done. Thankfully, nothing was stolen.
On a side note, I think I'd be a little ticked off at your dealer for putting their giant "Bill Board" on your rear hatch. I sure hope you're getting a monthly stipend from them for all the advertising your doing.