The photos show a wooden paling fence between brick piers. Each brick piers sitting on a single concrete paver approx 500x250 mm. The pavers sitting on top of an artificial timber deck. No foundation into the ground at all for the piers.
The helicopter was not this issue, their grand children and the public were at risk with that fence all the time. As the piers were just sitting on a paver, someone could have leaned on a pier and it could fall over.