Not buying it (and not apologizing for not buying it).
As far as I know, for the most part, 'bagger' and 'carriage person' are no longer two separate jobs - except maybe in really, really large stores/lots - and haven't been for years.
Stores assign people to collect shopping carts BECAUSE shoppers leave carts willy-nilly throughout the lot; they don't hire carriage collecters SO shoppers can be inconsiderate (or lazy, or any of the other excuses that have been or will be used in this thread).
Actually, even if everyone put their carts in the corral, they would hire these kids to bring the carts back to the store. As for ppl who say to park by a corral, I live in a congested area - I usually don't always have the opportunity to park by a corral - I park where I can get a parking space. If I'm near a corral, of course I put the cart there.