Billy, you're probably being facetious, but still ... no-one cares what you smuggle into a newspaper office unless you actually blow the place up or spray it with bullets. But everyone, whether they read the Currant Bun, the Mail or the Guardian, cares about aircraft security, because almost everyone flies and they want to know how safe flying really is. The newspaper serves the interest of its readers. There you have it.
No, I'm not suggesting journalists should be above the law. I'm just saying that these kinds of exercises -- testing security, testing the safety of products, testing the truth of government statements -- are all legitimate journalistic exercises and don't warrant the outrage that's apparent on this thread.