I stand corrected especially on one area, I just remembered that there are indeed cart corrals out there in the parking lots, unfortunately my walmart has like 1 on a huge parking lot which is really not enough, but it is true that most stores do have a lot of them, if they are nearby a car and that person still doesn't return the cart, then that's a problem.
Maybe that's why I see staff collecting carts, due to the lack of cart corrals, maybe stores that lack enough of them do this instead, but I am also debating within myself about the fact that there are tons of people that still do this mistake with enough cart corrals.
So I personally think the right conclusion would be, such people are not bad, but not responsible and are ignorant. When possible, returning would make life easier for staff that do collect carts too, they don't have to go all the way to collect all of them. And of course, avoiding the risks of the carts hitting other cars in-case of natural wind, great points that didn't come to my mind at first.
I think this one wouldn't go under bad though as I said, it has to be a lot more than not returning cart back to the car corrals to be a bad person....right??