There is disbelief and amusement in this thread but there was potential for it to get very unpleasant. What if a few alert passengers started to think on the lines of MH370, 9/11 or Germanwings, with a rogue flight crew? (Coincidentally Germanwings was en route to Dusseldorf) A few text messages or calls to loved ones and the next thing you have a full on terror alert.
Yes, they wouldn't think of asking any of the cabin crew or pilots what was going on/where they were going before going into panic/terror mode...