(Strip Number 437, Original Publication Date, 8 July 1983)
Panel 1: We find ourselves watching Jobsworth tell his supervisor (who I'll call Mr Tringe) that he has apprehended the Pattersons and seized their weapons.
Panel 2: As Jobsworth stands there convinced that he's saved the world, Mister Tringe looks sort of irritated as he fires off the toy gun and it makes a feeble zapping noise.
Panel 3: Tringe then tells Jobsworth "Come ON, Sid. I hardly think that they're going to hijack the plane with these."
Panel 4: As the Pattersons look on in despair owing to the fact that Jobsworth witlessly humiliated them because he started channeling Barney Fife, the man tells his boss "You never know, sir; they're a nervous looking bunch if you ask me."
Summary: I wonder if any of that has to do with them being made to look like terrorists because a nitwit reacted poorly to being surprised. Maaaaaaaaaaybe it does, maaaaaaaaaaaybe it doesn't. In any event, John and Elly don't blame him. THEY blame all of this inconvenience on their evil, parent-happiness-hating, chaos-loving children.