Agreed, 1 out of 3000 is horrible. To be a viable business delivery drones will have to have a safety record at least reasonably close to that of conventional road delivery. I would hope regulators would demand this but I'm sure that insurance providers will. Conventional road delivery services have to carry insurance and the cost of that is related to how often they get into accidents and how severe they are. If delivery drones cause more property damage and injury then their insurance costs will be higher.