HuffPo again. The linked editorial is worth the read.
Fact:: in theory, history, and legal precedent, some form of gun ownership is guaranteed by law.
Fact: this means guns are not going to disappear.
Fact: The average number of people shot in a mass shooting event when
the shooter is stopped by law enforcement: 14. The average number of
people shot in a mass shooting event when the shooter is stopped by
civilians: 2.5. The reason is simple. The armed civilians are there when
it started. (from here: http://larrycorreia.wordpress.com/2012/12/20/an-opinion-on-gun-control/)
LOGICAL conclusion: empowering teachers to defend themselves and their
students is the only moral option. Anything else is doing NOTHING
effective to stop shooters. It is merely a sop to hysterics.