Why haven't airlines added safety pads to their carts?
Because an inch or two of rubber isn’t going to stop a 300lb cart from breaking your foot if it goes out of control down an aisle. If your elbow is in the wrong position, you could hit it with a 300lb roll of memory foam and cause a compound fracture.
The maker of this video is just looking for things to complain about. Keep your body parts out of the aisle and you’ll be fine.