Another angle to this story.  The litter was horrific, no getting around that obvious truth.  But from looking at the photos I see lots of perfectly good camping gear left behind in the trash.  Some of the tents, sleeping bags and other gear could be cleaned up and SOLD to support the maintenance of the campground!  Those brats wasted a lot of money by abandoning their gear! But then they figured, "oh, I'll just hit dad up for more money to buy an new tent..."