In the context of the victim of an accident, I imagine "justice" as being the public acknowledgement that in some way, a member of society failed to protect the victim. I say this in the most broad sense possible, rather than the specific placing a shield in front of the victim to be the moment before the event.
In this case, a pilot erred somehow, so directly, that pilot failed to protect a fellow citizen. But more than that, there was a failure of imagination as to what could happen. Were the imagination of the show organizers and regulators to have been effective, they both would have acted before hand in their role, to limit or otherwise cause the conditions so no one would be in the path of an aircraft in uncontrolled flight.
The AAIB will take its time to carefully evaluate the role of everyone in this event, not just the pilot. The result will be a report, which will very certainly include recommendations as to how this type of accident could be prevented in the future. Pilot action will likely be one or a few of them, but not all. The "justice" will be the enacting of those recommendations for future events. That will sound draconian - "More rules!
" everyone will cry. But the new rules became necessary to assure "justice" where the actions of a pilot, and the failure to imagine of the organizers, resulted in gross injustice.
Revenge is pointless, this was an accident. Accountability?
That's what the lawyers will fight about in court!