That's very odd. Why would he think you would disavow all knowledge of the car? Unless it was a real total banger, surely anyone would rather be mildly embarrassed but get the chance to move the vehicle, than leave their car to be bumped, crunched and manhandled?

Our problem today was less poor parking, more trees, hills and walls. The people who moved their cars were parked perfectly properly on their own driveways, it was just that the van needed to infringe upon these to be able to move at all.