Put differently, even a perfect pilot flying a perfect aircraft in a perfect manner represented an unacceptable level of risk flying that display at Shoreham given the potential for disaster if something did go wrong
Even the best practised are not immune from errors, though in this case he had a safe place in which to crash. The Hunter test pilot, Bill Bedford, demonstrating the aircraft to the Swiss made the error of forgetting he was displaying at a high altitude airport and on the down line of a loop realised he may not make it, but did.