matelo99
Correct, hence 'defences in depth' whereby you can disable or lose one defence and the risks remain acceptable.
Add, the ground is also full of civvies (and other forms of life), which the MoD decision makers are required to consider. Shoreham should have brought this home, especially given the aircraft was neither serviceable nor airworthy, with MoD (according to the CAA) having THE major part to play.