Most of the dents in both our cars happen in those parking lots. The people just drive away.
If you are backing up and someone else is also backing up and you see them so stop, but they keep going anyway and hit you, insurance will consider that 50/50 and ding you both no matter what you say.

That's one of the reasons I'm kicking myself for not buying that 2-1/2 ton military surplus truck...

Thats why I park far away in a spot I can pull out of straight

I always Park near the back where there are hardly any cars or the side of a store.

Always reverse park