Odo has absolutely always returned the cart. In fact, I'd say he's tracked down everyone he can find that hasn't returned the cart and forced them to return one in front of him.

Nah, Bashir would devise a clever plan to everything work out just fine without people returning their carts.

Also, I'm pretty sure you got Garak wrong. He would promise never to return the cart, make a loud point about it for everybody, and insist on the subject every chance he gets. Just to covertly return it when nobody is looking because when Cardassia befriends the supermarket his people would benefit from the carts being correctly parked.

O'Brien returned his cart, and yours, and was mumbling complaints about lazy people while gathering two more when somebody drove a motorized cart into him and broke his ankle.

Kai Winn: grabs you by the ear and declares that the prophets dictate you not only return her cart for her, but that you must unload her cart into her vehicle. And if you don’t, your pah will suffer, my child

I'm Worf.

Was reading this to my SO, and was given a correction for Quark: gets Rom to pay Quark for the privilege of returning Quarks cart.

But people who don't return carts are just as bad as landlords???

Sisko - chance to also perform a warcrime while returning the trolley.

Do you know how many carts Dukat spared from getting pushed into traffic?

The real move is to park next to the cart return

Morn: never seen with a cart

Changelings/Founders: "It's a flaw of the solids... To turn something as simple as food transporting - into a fundamental flaw of a decrepit society. Their so-called "cart" -- a mere extension of the hands, solids fail to recognize as part of one's primal nutrition gathering needs in order to just survive. But instead, as logical weapons to other solids who oppose their incomplete transportation rules..."

Garak will try to eliminate all carts, for the safety of the alpha quadrant cars.

Bashir would definitely return his cart and others, and not be irked by it.

A couple minor changes to this one:

Obrien: gets imprisoned and tortured while returning cart, gets dumped next to the corral for pickup

Garak: convinces someone else to return the cart. They are happy to do so for such a charming gentleman. Merely a simple tailor, of course.

You have two wolfs inside of you. One returns the cart, the other does not.