I do not care whether you drive a Pinto or a Mercedes; a Geo or a Porsche. When you unload your shopping cart and then leave it sitting next to your car rather than pushing it back to the cart corral, you show your contemptible cretinism. There are no excuses. If you have the time and strength to push it through the store and out to the parking lot, you have the time and strength to push it another 50 feet to where it belongs.
Really. Without exception. If you make a million dollars a year but are too lazy and self-absorbed to care whether your own shopping cart rolls into someone else's car, then you are a loser.