So, why are those cars unsafe? As far as I can tell, it's only because other people drive monster cars which is the whole point of this thread. If most people were in smaller cars, then smaller cars wouldn't be unsafe.
The low mass of the frame means the restraint system puts more force on you during a collision.
Motorcycles don’t have that problem. Neither did cars back before seatbelts; a bit of shattered pre-safety glass old school windshield never hurt anyone.