A PACK, NOT A HERD:

For more than four years – steadily, seriously, and with the unsentimental rigor for which we love them – civil engineers have been studying the destruction of the World Trade Center towers, sifting the tragedy for its lessons. And it turns out that one of the lessons is: Disobey authority. In a connected world, ordinary people often have access to better information than officials do.

(Via DefenseTech). Some of us have been noting this for a while.