The reason I have a different opinion to you Hebog, is partly that flying at airshows has always been accepted to be relatively risky act, participated in by knowledgeable and competent individuals. The risk of an accident should always be minimised, but cannot reasonably be considered to be as near-zero as even normal GA flying, let alone air transport.
But especially: aviation safety regulation is first and foremost about protection of people who are not expert participants - in other words paying passengers and innocent third parties. Lower down the ladder is the protection of knowledgeable aircrew.
So, in this case, yes - of course - identification of the cause of the crash and prevention of future related accidents is extremely important.
BUT, it is not within the mindset that governs aviation safety regulation, as important as measures to protect the general public from the consequences of a crash.
G