http://www.msnbc.msn.com/id/15142930/?GT1=8618
1.Not only would it scare some folks, the kids will start bring guns to school because they would think it's only fair.
2.There's at least two police officers at my school, they can fight back.
3.Yes in the hands of specially trained air marshals not public school teachers.
4.More tragedies happen? Haven't the amount of these tragedies been going down since the 80s.
I also must say I have some pretty crazy teachers, what's going to prevent them from going on a killing spree themselves.