There was a news article posted here a few months back, about a mother who got charged with leaving her child unattended in the car when she ran in to pay for petrol, at all times she could see the car and child and she was away from the car for a minute tops. Who wants to take that risk? What you and I think is reasonable someone a police officers may not. Personally I think it is ludicrous, it is far safer for my kids to remain in the car rather than walking through the petrol station. But what are you going to do?
Some shopping centres are set up so badly, there are a few here that are good, but there is one where the trolley bays are soooo far away, seriously - you'd lose sight of your car if you went to put them back. I have only left it out twice, but both times pushed it up again the wall and there was no way it would be able to go anywhere. I hate when they are left in the parking bays, that is just rude!