If Hulk Hogan’s son would have known the Hulkster would find out he was drag racing, his friend would still be alive.
Not so. Terry Hogan was at the accident scene moments after it happened. He couldn't have been watching. And, while his friend isn't considered to be a productive member of society, he is alive.
These sorts of devices will not prevent accidents at all. Let's use the parent/teen argument for why this data is good. Today, I can go an buy a device for my car that will record speed, seat belt useage, location and even G forces experienced. I put my child in the car and send them out. Data is now being collected but I do nothing with it. Why would I spend the money and do nothing with it? Because, if you are that sort of overprotective/non-trusting parent your kid isn't getting out of the house all that much and when they are they are going in someone else's car.
Now to the reality of the situation. I buy the device to hide in my kids car collect a bunch of data and do absolutely nothing with it because I don't have the time. I spent them money because it made me feel safer.
I guess I am going to have to wrap my car in tin foil so the government can't track my trip to the 7-11.