Most if not all big box stores have cart corrals out in their parking lots where you are meant to return the carts so that they can be collected more efficiently without having some employee run all over collecting carts. Andtheres the matter of run away carts especially if it’s a windy day. Those carts can really get moving and cause some damage to cars parked out in the lot. No one is saying to take them back to the entrance of the store, simply to put them in the collection point so they don’t wander.