Unfortunately, too many people drag far too much stuff past the gate into an aircraft.
I well remember an occasion in which a fellow passenger carried a domestic refrigerator upon her head up the steps onto an airliner in Lagos as cabin baggage on a domestic flight. The lady was quite outraged when the cabin crew demurred.
Was the passenger wrong? Or the cabin crew? Or the ground crew?.
It wasn't an American airline, so nobody beat the living **** out of the passenger/customer. Not a white one, anyway.
They don't do that in a Murrica, y'know.