Ground Risk Assessment
Directly below the apex of a vertical maneuver might be the safest spot on the ground when things fail to go according to plan.
It's been pointed out that a local school is closed down during the event, but that did not prevent a crowd gathering nearby to watch as can be seen in photos from high ground just before impact. The toll might have been much higher if the Hunter wreckage came through that crowd.
While risks within the airfield and to adjacent structures are managed, we also need to include areas where people can be exposed to risk during all phases of maneuver.
A road closure would have done that. If a road segment is too busy for closure, then maneuvers have to be planned to reduce the risk at that point to no more than that with aircraft on normal approach and departure.