You seem like a guy I would like to sit back and have a few while discussing things without anyone losing their cool. But you can not seem to understand that no one is saying arm all teachers.
Some people are, but I understand that you - and as far as I can tell the other people in this thread - are not. I just think that 1: concealed carry permits are not as tough to get as I would like them to be in all jurisdictions and a lot of morons have them; and
2: open carry by teachers shouldn't be the answer.
People with concealed carry permits do stupid things with their guns all the time. In fact, some idiot using his/her concealed weapon - permitted and legal - in a completely inappropriate way is much, much more likely than a school shooting as we all know. There are a bunch of examples every year of some idiot with a concealed weapon permit shooting someone outside of a bar in an altercation, or thinking he/she is Rambo and following some kid down an alleyway because he "looks suspicious" or almost - or actually - shooting the wrong person because he/she shows up at the scene of something and thinks it's time to spring into action without understanding what's going on. That needs to not happen at an elementary school.