The display line was well defined and the risk management of the display took into account the surrounding built up areas so that risk management cannot be called into question. Sadly that management did not account for spectators gathering in unauthorised areas outside the field precisely where those poor souls perished.
If it is proven that the pilot entered the manoeuvre too low/slow then it comes down to an error of judgement made by an experienced pilot in otherwise favourable conditions. Unless someone can prove recklessness or negligence on the part of the pilot.... a single error of judgement is hardly enough to convict for involuntary manslaughter.
Thankfully we don't have the attitude of some of the Mediterranean nations where the mentality is... 'If somebody dies - Somebody must pay'.
It is right and proper that relatives of the bereaved get answers to all their questions, but let the man be judged upon the facts... not by cheap newspaper headlines whipping up the relatives into a frenzy of revenge.