so why dont all cars have roll cages as standard?

https://www.youtube.com/watch?v=HWOANXNGrZc#t=544

skip to 6 mins.


so if the guy can walk away from that - why arent roll cages standard in cars?

Source: http://ninjashoes.net/forum/showthread.php?83138-so-why-dont-all-cars-have-roll-cages-as-standard&goto=newpost

Andrei Arlovski  Ricardo Arona  Noboru Asahi Marcus Aurelio  Mikhail Avetisyan