If we banned everything that had the capability to kill or negatively affect the health of others, we would have to return to the dark ages.
I never understand why everybody tries to treat aviation as somehow different and hold it to greater rules.
More passers-by are killed by drivers losing control of wheeled vehicles in the UK every day than are lost per year to aircraft accidents but it is the aircraft that are singled out.
Kids die in swimming pools but we don't ban them.
Kids die in dinghys but we don't ban them.
Kids die skiing but we don't ban them.
Kids die on ponys but we don't ban them.
The list is endless.
The only way to remove risk is to remove life itself. We need to accept that accidents happen and move on, not just ban all the little things which make life worth living.
All that being said, I do find it strange that under our current display rules, spectators who have paid money to come and watch a show have more protection than those with no interest!
Personally I would make all paid spectators sign an agreement accepting responsibility for their own health in a more dangerous environment.