VH-XXX,
In one way you are correct ... there is definitely a chance that a nasty even might happen during an F-111 exhibition.
However, and it's a big however .... we, the public have accepted that risk, knowing that it's quite small and that the most probable outcome ... a spectacular sight ... is worth taking that risk.
We take these risks every day, walking out the door. There's a possibility that I might get hit by a truck as I try and cross this busy road. But, I'll accept that small risk, if it means I'll most probably get to the bus stop and get to work.
It's called life.