And a lot of the times even handicapped cant use them when they are grabbed up by the overweight people or kids just screwing around.
Yea, the XYL and I had that happen once. We were in a Burlington store looking at coats (go figure). At the time, the XYL required either crutches, wheel chair, or a scooter. So this time we were using the scooter. My XYL stopped it in a aisle to try on some coats and, with some help, we moved on to the next aisle, leaving the scooter in place. When we went back a few minutes later, the scooter was gone.
I found a 5 year old and his 2 year old sister flying around the store with it. When I found them I just kicked them off with no explanation. I didn't figure I needed one because their parents were right there, also looking for coats, but completely ignoring them. I guess if they got killed, they could make new ones. We never left the key in again.