Anything that flies can crash, it matters not why that happens, the pilots know the risks and it has happened to a Red Arrows Hawk, an Italian Typhoon flew into the sea in September. These were properly maintained military planes with experienced display pilots, it's a dangerous game but if I was clever enough I would be flying with them.
What does matter is harming Joe Public, at Shoreham the chances of an aircraft crashing onto a crowded road was remote, when a pilot looses control we are only protected by random separation. Could it happen at Fairford, yes, it's remote and highly unlikely but to be totally risk free there would be no air show.