What amazes me most about that crash video is that there are no airbags deployed. You explained that racing safety systems don't belong in street cars. But I didn't expect the reverse as well.
I'm not familiar with this category of motorsport, but at least in F1, all safety systems need to allow the driver to leave the car in less than X seconds in case of accident (for example, if the driver needs to get out of the car in the case of a fire).
So maybe, and this is a guess, airbags are not activated in lateral impacts like this one as they could make this escape more difficult than the damage they are preventing.
