The person who is backing out of the parking space
Backing up--it is your fault.
The person backing out. If you were in the lane/road behind them they needed to use caution when backing out.
If it only happens when backing up, you may have the parking brake engaged.
Any time the driver who is backing is at fault, in all 50 states.
both of you for not looking back
Depends on the jurisdiction, but typically, two vehicles backing up is a 50/50.
If you strike him - you are at fault. He can be charged with the No Parking violation but YOU are charged with the collision.
You are at fault.
The driver backing up. Unless you can prove the other car was driving unsafly.
backing out- you have considerably less vision
The guy that is walking.