I watched that live and I don't agree. Ok, I do agree that everything should be done to make motorsport safer but I don't agree that Surtees' accident should be referred to without also mentiong that motorsport is inherently dangerous and that an open-cockpit design is always going to be fundamentally flawed, the driver's head is always going to be vulnerable and I don't think its possible to solve this without comprimising safety in another area. It was unfortunate but couldn't be avoided - again in that instance the wheel tether failed because the forces being exerted by Jack Clarke's wheel on its tether were so great that it reached its limit. Like I said before, a tether cannot take unlimited energy without comprimising the car's crash structure. And if the crash structure is broken apart, you may not have had one fatal accident but two.
Of course, the sport should strive to further improve wheel tethers, but currently they just can't take some of the rediculously high forces exerted by the wheel and this isn't something easily solved.
Saying that though, it does also state on your race ticket "Motorsport is a dangerous sport, you spectate at your own risk" so there is also an element of fans and marshals being aware of the dangers. Though obviously I agree spectator and marshal safety are important too - just its not just drivers who are "aware of the dangers" and it shouldn't be seen as that only the drivers are accepting risks, really everyone involved at the circuit is accepting risks.