It's unfortunate, but that's what happens when people get their cars stuck on a single track and then don't get them out quick. It pisses off the legal users and the vandalism escalates. Not entirely the driver's fault, since the signs get torn down, the gates get forced open and there aren't many legal options. Enforcement is weak as well.
If you look at
@Faust29's 2nd picture, you'll see a big hole 'somebody' dug to keep them from driving to the Luge. Most people turn around, but the jeep in the gully got stuck in the trap, and the Mercedes managed to get around it but couldn't get out. Eventually his vehicle got pushed off the trail and ended up on top of the jeep. Then the Mercedes driver got to pay to have them both airlifted out. By that time, the jeep had been fully stripped.