I leave the carts that I find near the handicapped spots, as I know when my back goes out I really appreciate having a cart to lean on. I think it’s common for a cart to be a sort of crutch.

My own carts I take back to the store unless I’m way at the end of the lot. If it’s raining or something, always back to the store. I’m already wet, and I don’t wanna make someone trudge out in the wet any longer than necessary.