If that doesn't do it, we can always count on lunatics like Jack Dunphy to help. At PJ Whatsit he comments on a Ready Houston video that shows office workers fending off a shooter with chairs and coffee pots. While he commends the can-do spirit, Dunphy is yet unsatisfied -- he wants those desk jockeys armed:
Wouldn’t it be far preferable to bring a gun to the gunfight instead of a chair or a coffee pot? ...If I were to enter an office building under those circumstances and ask some fleeing worker where the gunman was, I would hope to hear an answer like this: "He’s face down in the stairwell. Williams from accounting shot him."I bet many of you folks are at an office right now. Take a look around.

Sure, arm the workplace. What could go wrong?
UPDATE. Arm the teachers, too.