If the car randomly caught fire while going 40 mph or something it would be different.
Cars don't wreck themselves unless they have defects.
No defect was at play here therefore the consequences once the accident takes place are harsh.
Besides the street legal race car argument sucks on a safety standpoint. One of the main reasons that the boxster is safe is because for the most part it's the same bits and pieces that some gt cup driver is likely to smash into a wall on track. Being race derived is actually an argument FOR safety.
Essentially the CGT was a prematurely canceled Le Mans car that Porsche traded its entry in Le Mans with Audi for an SUV platform. That being said assuming the CGT is anything like the GT1 or 919. Paul walker is simply a lot less lucky then Mark Webber.
http://youtu.be/b31O4FmljGY
http://youtu.be/ZXZaAuyuYmQ