You may find that 'security' includes the security of assets that are air side of the crowd line, ie on the other side of the airfield. They are at more risk should anyone drop an aircraft during a display and the Shoreham experience may have put that into sharper focus for people.
Fostissimo,
I was about to say of course, but why has it taken to now to become concerned about this? Its been an ever present problem from the start of airshows going back to 1920 and the Hendon Air Pageant. However, I think Leon's answered the question regarding what appears to be an insurance problem.. That's what kills off every pursuit with the slightest hint of danger in the end.
FB