It takes 30 seconds to return a cart. Nobody is so busy or has so many kids as to not be able to wheel the cart into the cart stall. If you have that many kids, then you probably can't really safely grocery shop in the first place.
The reason it gets brought up is exactly because it's a small thing to do that is generally accepted as being the right thing to do. You basically won't find someone defending not wheeling back the cart as being the right thing to do (outside of maybe a true emergency).
If you have kids, you let them return the cart, because it is fun for them and already start to move the car out of the parking lot. That way you save even more time.
It takes 30 seconds to return a cart. Nobody is so busy or has so many kids as to not be able to wheel the cart into the cart stall. If you have that many kids, then you probably can't really safely grocery shop in the first place.
The reason it gets brought up is exactly because it's a small thing to do that is generally accepted as being the right thing to do. You basically won't find someone defending not wheeling back the cart as being the right thing to do (outside of maybe a true emergency).