The primadonna, marketting department crap about no car crashes harks waaay back to the 16 bit days. I remember the classic 2-d Lotus Esprit Turbo Challenge on the Amiga (yes it looked 3d but trust me it was a vertical scroller)
Basically Lotus let them use the brand but the car wasn't allowed to crash and it's been downhill ever since.
I have thought of two counter-propaganda solutions that might help remedy this but, unfortunately, you'd need participation on such a massive scale that it'll probably never happen.
Anyway, in the interests of venting and living a pipedream I'll outline them here.
1) Petition/Email flood each of the manufacturers begging that they allow the cars to be demolished and turned on their roofs with a caveat that, if we're ever thinking of buying a Ferrari or whatever, that the memory of seeing the car destroyed in a video game will not affect our purchasing decision.
2) Find someone who's survived a car wreck and convince them to threaten a lawsuit against the manufacturer and Polyphony digital for giving the impression that the vehicle was indestructible in a 200mph head-on collision. If we could manage to get the media circus involved, by decrying the car manufacturers as irresponsible and dangerously misleading then all the better.
Of course option two could backfire and result in all the car companies withdrawing the rights to use their car in any videogame but I still think it'd be funny as hell, cos that's the way my brain's wired.
Anyroad, like I said - pie in the sky - never gonna happen.