I hope they catch those responsible and make them pay for the damage and give them a hefty fine and a suspended sentence. No excuse for it, and while I appreciate the problem caused by this sort of thing, you have to remember you don't own the space in front of your house. We have no off street parking where I live and you just have to park where you can. The biggest problem is those who park a car either ten feet from the car in front, or ten feet from the car behind, They never reverse park and take up two spaces with one car. Mindless vandalism, which should be result in appropriate punishment.
Been using the same car park for 6 years now, (usually twice a year) always take note of mileage, never had more than few tenths of a mile added. The site is 5 acres and covered by CCTV.
Rarely gets less than 5 stars on it's reviews and, touch wood, never had a problem.