Jason Parked His Car on a Hill,but Failed to Set

Jason parked his car on a hill,but failed to set his parking brakes.The car rolled down the hill and hit another car,damaging it significantly.The owner of the other car,Yang,filed a lawsuit of negligence against Jason,who pledged that he had no intention of damaging anybody's property and that he shouldn't be made to compensate.Discuss the methods the court and the jury could use to arrive at a fair decision.