I haven't heard anything about what the CAMPGROUND OWNER is doing about the theft and danger in his campground?
If you are friends with the owner and other 'regulars' I can understand why you want to stick with him and figure out a way to resist/combat the problem.
Maybe he can build a FENCE to make it inconvenient to cross and more inconvenient to traverse with goods in tow for the perpetrators?
If you feel compelled, you can take cases of bottled water and put on the other side of the fence.
Lots of options, depending how deeply you want to become involved and the amount of exposure you desire.
Good luck and keep us updated!