Like everyone else, I'm deeply saddened by this awful accident and as a family man can only imagine the devastating consequences it will have already had, and will continue to have on so many people, many of whom were totally unconnected with the air show.
Speaking as someone who previously held an RAF aircraft display authorisation and instructed in aerobatics, albeit not in the Hunter, I can also imagine the terrible effect this will have on the pilot himself, both now and in the future and my sympathy also goes to him and his family.
As usual, there are many theories and possibilities why this might have occurred and of course all this will be very thoroughly investigated by the AAIB in due course. I do have my own personal theory which I have discussed elsewhere, but won't be posting it here.