First off, condolences to the family of the lady that died.
I guess the reason we all have loads of insurance, from health, death, liability, etc., is that we are accustom to everyone guarding against every possible scenario that can possibly take place in life that may hurt or kill us, NOT. Accidents and situations occur. I am sure that NHRA, the track, and the race team have liability insurance, and that is who will be handling the next of kin and their ambulance chasing lawyers.
And part of our life experience is death. We will all have the occasion to experience it. Why, when and where it happens is very hard for each of us to control. If you believe in a God, destiny and fate, this was a situation where that lady was called to life hereafter. It was just her time.
We don't stop our lives when some one is killed in an auto accident, so why should an event be stopped?
Our tort system has limited us on what we can say and what can be done in emergency situations if you are remotely involved.
Many tracks have a rule against standing at the fence. Others have more room between spectators and the track. What is a safe distance? How tall of a fence could you build to make it safe? How fine of a mesh to keep small fragments from coming through?
If five 5/8" studs will not hold a wheel on, what material can be used for a tether? If the wheel had been installed errantly, then what makes us think the tether would be installed correctly? And if we tether the center, what happens when the wheel breaks or the tire comes apart? What can they be covered with that will withstand the forces exerted by the wheel and/or tire? Not saying it cannot be done, just that I do not have an answer.
The Safety Safari is for on track emergencies. There is an ambulance and emergency staff for the spectators that was dispatched immediately. If some of the spectators that were calling for help would have been more prepared themselves in first aid so that they could be a help to anyone around them that needs it they wouldn't have been standing there feeling useless yelling.