I confess that I would have no problems with lethal measures in a case like this. The UK is at war, as are we. The concept of a 'secure area' at an airport 'should' mean something. When crap like this goes on and we get quotes like:
"If they want to continue in this lawless manner, then yes they can," spokesman Nick Barton told Sky News.
and
'We do not run a fortress, we run an airport.
then it is apparent to me that the concept of a 'secure area' does not, in fact, mean anything at all.
"sigh"
Since it's an airport, a low level, say 10' off the deck, supersonic pass by a Typhoon would do nicely to "scatter" the crowd....