Why should you turn your front wheels to the right when parking uphill on the right side of a street without a curb?

• So the vehicle rolls off the road and not into traffic if it moves
  Explanation:

  "When parking facing uphill on a street without a curb, turning your wheels to the right ensures that if your vehicle starts to roll, it moves toward the edge of the road instead of into traffic, reducing the risk of an accident."
• So the vehicle rolls into traffic and not off the road if it moves
• Because it is required for parking gear
• To prevent the vehicle from being unlocked by other means