As a parent, this is such a challenging topic for me.
Do I think having someone armed and trained to defend is a good idea? Of course.
Do I think it should be a teacher? Now that's tougher. My sister is a teacher - just got her HS History certification after years of teaching elementary school. Even with CHL training, I think that would be a disaster. She's 5'2 and not always on her guard - she'll be one of the teachers who will want to carry, but then forget to lock her desk. Any boy that's hit puberty would be able to wrestle it out of her hands - or will she shoot him in front of her class to keep him from getting it?
My concern would be complacency - they don't use it every day, they aren't training regularly - it's that whole muscle memory thing. I'd also be concerned that when LEOs and SWAT do arrive, they're looking for someone with a gun. They're trained to take that person out. Will they now have to stop and figure out if the person with a gun is a teacher or a shooter - or just shoot and ask questions later?
As a parent, I'd also want to know if my kid was in a class with someone with a gun and what safety precautions are being taken. But that would also tell people who might want to do harm which rooms to avoid. So I'm conflicted there. Could the district simply say - at least one of your child's teachers is armed. This is the training, and how we plan to protect him from someone unauthorized from getting the gun.
I work with cops every day, I see the training they go through, and know they still make mistakes. I don't think it's fair to ask teachers to go through that, but I think it's necessary if they are going to carry. I think I'd prefer to let teachers be teachers and pay officers to be officers. In reality, you get what you pay for.
I think there are things schools can and are doing to make them safer - especially single access entry points, with double sets of doors - you go through one, get checked in, and THEN the second set is unlocked. Easy enough in newer schools, which are designed that way - but more difficult to retrofit.
I don't have the answers - but it worries me.
"If you're in the midst of a midlife crisis, you could buy a convertible, have an affair, or upgrade your cup size. But you'll probably be happiest if you save a dog's life." - Jen Lancaster