Stock Seats and Cage/harnesses question

My understanding of this: The cage means all the energy normally absorbed by the car's body gets transmitted directly to the occupants. Add the overhead bars and the fact that no-one is wearing a helmet on the street and it can get pretty ugly in an accident. On a track, it is rare that a caged car hits anything perpendicular to it's direction. Most of the time it's sliding along whatever wall is there. A frontal hit on a car with a cage will more than likely send everyone first into the halo bar if it's there, or the main hoop if they are in the back seat then out the windshield... Because none of the energy will be absorbed by the body flxing and bending. No car with a cage should be carrying any passengers on the street unless theyare restrained the same as the driver, and the bars should be padded overhead.