Never good when something crashes. How ever I really don't see the problem more then for the owner of the plane. As long as all planes are flown according to the safety regulations a crash like this are spectacular but never really dangerous.
Also this year they moved the net back at least 10meters more which gave much better clearance to the spectators. Much more comfortable when flying and handling the planes before and after flight. Previous years they used to land just behind your back when you were preparing for the flight.
The really dangerous big plane accident I know of was the B29 crashing. But I would not blame that on the airframe....