I felt it looks appreciate (very tolerate) for rural schools with small classrooms, so that where teachers or school admins that put guns in safe box. The guns are pretty stronger in rural area.
Yes, you are correct about schools are safest place for children, but the school shooting can happen in anytime, pretty much unpreventable and unpredictable, unless anyone know about tactical that try to prevent from happening.
Just let you know - ban on high capacity magazine is part of gun control, but it isn't bad thing and I don't think any new laws will going to prevent the crazy shooting.