FWIW, many of us have argued about the safety of the tracks, cars, etc. time and time again... But in the end, drivers know (and assume) the risk (and there are a variety of them that change in importance from facility to facility) each and every time they strap into the car. Conversely, we continue to watch, so in a way, we've decided to accept the risk as well.
Should people continue to look for and be open to new ideas & improvements, both to the vehicles as well as the racing surface, shutdown area, etc.? Sure, of course they should. But to complain about a one hour delay after the equipment did exactly what it was designed to do and allowed the driver to walk away unscathed is probably not necessary - again, it's a risk we accept as fans. Me personally, I don't like delays... but I hate losing my heroes even more, whether I've accepted the risk or not. Just my $0.02
As an interesting side note - when an aircraft can't use the arresting cables to land at sea (for whatever reason), we use a giant net just like they do for race cars... and it works. The aircraft weighs a lot more than a race car, but it's generally flying a lot slower (150 knots or less - usually). That said, it has to stop the jet in a very, very short space or the jet goes over the side in front of the ship's angle deck... which is obviously bad for the aircraft, the pilot and the ship. I was aboard USS Constellation in 1999 when we barricaded an F/A-18 at night because he had one engine fail (shut down altogether) and the other kept experiencing compressor stalls. The pilot actually had to keep popping in and out of afterburner WHILE DESCENDING TOWARDS THE BACK OF THE SHIP AT NIGHT. Impressive piece of flying if I ever I saw one.