The YT video is bizarre. It's interesting that in the comments appended to it there's a split response. One one hand some people believe that the crew and passengers actions served (intentionally?) to reduce the tension in the situation - and thereby reduce the chance of the hijacker acting unpredictably.
Others react as I did when I initially watched it - "these people are idiots..."
But any way you view it, the compulsion to take mobile phone snaps of every situation that occurs in life has become so powerful that it even seems to over-ride the instinct for self-preservation.