Is there away I can put in a rule that magnetcrane.entity can't destory anything but cars or something? 

I have people going around knocking down peoples bases and everything with this fucking magnetcrane.entity

hi, entity groups:

    {
      "name": "junkyard",
      "members": "magnetcrane.entity, carshredder.entity",
      "exclusions": ""
    }

    {
      "name": "cars",
      "members": "BasicCar, ModularCar, BaseModularVehicle, BaseVehicleModule, VehicleModuleEngine, VehicleModuleSeating, VehicleModuleStorage, VehicleModuleTaxi, ModularCarSeat",
      "exclusions": ""
    },

and rules:

"junkyard cannot hurt anything"
"junkyard can hurt cars"