Mohammed Atta and his cronies criss-crossed this country while planning the 9/11 attacks. If there was some info that would have been useful in catching them before they acted, law enforcement should have known.
As it stands, at least one of the 9/11 plotters was stopped for a traffic violation the night before the attacks, but was released. If there had been any way for the officer who pulled the plotter over to recognize him as a terrorist, it may have saved hundreds, if not thousands of lives.
Sometimes these alerts sound funny, but who would have thought that a bunch of middle-eastern bachelors who liked to frequent strip clubs and traveled to Vegas were al Qaeda terrorists planning to destroy the WTC and Pentagon.
We need to be vigilant.
I'm usually one of the first to mock these big brother tactics, but this is just an alert to law enforcement that an almanac could be a possible flag, presumably in conjunction with some other flags, like arabic nationality, false IDs, and a suitcase of cash.
Also, should you have a situation with those elements, the almanac might be useful in ascertaining possible targets (like those in the almanac circled in red marker with "Death to all!!! Allah is great!!!!" scribbled over it.)
Minus the other more sinister markers, the presence of an almanac is more likely a bit of a "dork indicator."