That's more because of things like airbags and crumple zones than bigger cars. Weight doesn't help you when you hit an overpass or a utility pole, and is only a relative advantage when you hit another car, so the average going up doesn't help anybody.
I’m sorry, would you prefer lighter cars with fewer (heavy) safety features? I’m not opposed to that with informed consent from the customers, however I’m not sure what point you’re making
