As we all know, the crotch bomber tried to ruin America and Christmas by exploding a plane, but only succeeded in burning his testicles (one hopes very, very badly) before being jumped by a Dutch film director. The director subsequently made a ton of money off of his story, thus earning his American citizenship through a love of capitalism.
As a result, the TSA, known for its sanity and non-reactionary decisions, discussed banning anything vaguely electronic and standing during the last hour of international flights to the US (and then subpoenaed the bloggers who published the potential policy leak. Class. Act). So what isn't electronic, and can keep someone sitting and entertained for at least an hour? Clearly books!
Thus, books are the result of stopping terrorism. QED, folks.