Jeeps jeeps jeeps

This has been baffling me for the last few weeks.
Why and how are Jeep’s allowed to drive with no doors?
How can the dmv say thats allowed as long as your door mirrors are still attached to the body of the car?
Why does a seatbelt mean Jack shit if people are driving around with no doors? A seatbelt isn’t gonna keep limbs inside the vehicle if it crashes/rolls 😓😓

Pea brain can’t comprehend.