It is a strange situation,supermarket car park you find a empty area some distance from the entrance come back and the car is surrounded,my thoughts are that most of us look after our cars keep them clean most are Mercedes and other drivers think that by parking next to us they will not get damage,without doubt supermarket car parks are a real danger area for minor and not so minor damage,where I live we have a Morrisons which has a big car park and the distance from the far corner is a large one ,touch wood never had anybody park next to me,I noticed last month that a local Home Bargains has much larger parking spaces and so if drivers park well there should be no damage.