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I have NO education whatsoever in car construction but from my point of view the car should stay in one piece to absorbe energy etc what safety can add you smashing into something with back your seats cause theres nothing behind your seats
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from a simple phisics standpoint, lets assume that car A has some mass.
Car A is then split in two in an accident at speed, thus becoming Car A , and Car Aa
Car A has the occupants
Car Aa has a greater portion of the mass, IE, Engine, Transaxle, fuel.
Car Aa will have greater Momentum, even when traveling at the same speed as Car A; remember, Momentum is Mass x Velocity.
With Car A (occupants) having less mass, it requires less forces (under no grip circomstances) to come to a halt; thus disipating some of the impact... less momentum = less force to stop the car = less injury in the saftey cage.
One of the saftey components of Carbon Fibre is its unique ability of absorbing impact, if taken at the proper direction, IE, headon; as it literally disapaits the energy in a constant mannor; rather then a strictly abrupt stop, or change in direction; which could more easily kill the occupants depending on the G load.
That said, there are tollerances which an are not specifically designed for; such as a 200 mph crash into a telephone pole; this is where the real world becomes the labratory.. but sure, a computer model can help come close to modeling such instances with finite element analysis