isn't it weird that the article only used a single source? That's not very good journalism is it? Don't you think some pertinent facts might have been left out? Perhaps the fellow was making a show of the book to tweak people and be cute? I recall some previous articles written with an eye towards demonizing those who ejected suspicious passengers, omitting key facts revealed in other articles that made the ejections seem much more sensible. The couple who opened the exit door? The guy who asked to leave the plane (after cabin door shut) to "get some papers" after other unusual behavior...
What we know is the guy wanted to board a plane with a book featuring a terrorist on the cover holding dynamite. The book itself was about a person whose primary activity consisted of bombing various things. That is a valid reason for arousing suspicion and extra attention no? Can you sympathise with the employees who were not comfortable boarding with him? I can. I don't know whether that means he should be denied boarding, but the employees are fully within their rights to make that call...