...from the corral?
Right, there are.
There are janitors too, but hopefully you throw your trash in a bin.
Not applicable.
Honest question: why not?
Well, since when do we confuse littering with leaving a shopping cart in a parking lot? Unfortunately people do litter all throughout the store. I just don't view them as similar issues.
Companies don't want to pay baggers, so you bag your own. They don't want to pay cashiers, so you self scan. And since they already don't schedule baggers, there's obviously no one to gather carts, so they expect you to now do that for them.