I had a similar story to the original poster in that my car was hit while I had parked it on the street. That person untangled her car from my mangled bumper and took off like a bat out of hell without leaving a 'I is sorry' note.

Thank g-d for the nosy neighbors that saw the whole thing, they gave me the make year license plate numbers and the vivid descriptions of the hit and run perp.
After ID'ing her through the police, I was able to recoup most of the damage from her insurance carrier.
The nosy neighbors got a bottle of nice scotch for their efforts.

Like someone said, there are some bad ones and some good ones in our fair city.
Salaryman