This morning I see that Police have arrested two people (a man and a woman) in connection with this.
I suggest, if found guilty, they be chained to the front door of the airport with a large printed sign explaining what they have done.
And a large crate of eggs and tomatoes nearby, for people to chuck at them.
(as in the Middle Ages)
But I expect they'll merely get a few hours Community Service and a slap on the wrist.