I don’t understand how coin locks keep the carts better maintained. With coin locks, customers are still “pulling carts through bumpy parking lots, wrestling t

I don’t understand how coin locks keep the carts better maintained. With coin locks, customers are still “pulling carts through bumpy parking lots, wrestling them across the threshold of doorways in and out of the store, and forcing them up and down the curb.” The only difference maybe is they are all being returned to a covered cart shed that is protected from the elements. Then why blame the customer with all that stuff above?