Well, to be honest, I didn't steal any shopping carts, that one in the photo is owned by the condo building where I wash my car (looks stolen but it wasn't me if it was). The first shopping cart I acquired was near my home while out walking my dog many years ago. I found it abandoned in an alley and I figured it was fair game as there was a store for almost a mile around. Ironically there's actually a finders keepers law in Canada.
There is one occasion when I was doing my orange peel removal and someone had taken my shopping cart from my interior parking spot storage area and urgently I needed a replacement to keep working. So I drove to the local grocery store (in my mod'ed Jeep SRT8 with the back seats down) and when I pulled in the lot I just didn't feel right randomly taking a cart, so I went in and spoke to the manager and asked if I could "borrow" a shopping cart. He instantly remebers me and my Jeep SRT8 (they load the groceries in it back, regularly) and said, "it's kind of odd request but sure take one, but only one please". I actually brought it back to the grocery store cleaned and detailed once mine was returned.
I don't condone stealing but if you find an abandoned shopping cart their worth pushing home (they are unsightly, IMHO so I store mine under a tarp or in the backyard shed)
P.S. there's always an abundance of abandon shopping carts right after the first of the month... Always found this fact, hilarious.
