Schools, summer camps, sporting events, theaters, amusement parks, universities and other so-called gun-free zones -- are soft targets that are going to be exploited by criminals/terrorists (one just has to look at where those horrible acts were comitted in Russia (Beslan), Norway, US)
Just like the planes where in 9/11.
so training and arming a portion of the staff that is operating the facilities, as well as securing access -- is essential
Praying, reading books, closing doors and closets -- are not effective measures against evil-souled animals who are there to end their lives and to take as many people with them as possible.
There are schools that have been taking steps in this direction.
http://www.sacbee.com/2012/12/15/5056005/one-texas-school-le...
I would also venture to say that media coverage must change the protocol in cover this kinds of events things like a) name of the criminal must not be announced b) reasons/intent must not be announced/mentioned/discussed on broadcast networks c) number of victims
so that the media does not feed the possible copy cats.