Take away the funding stuff and it's still a pretty weird idea. All it does is draw more attention to the idea that you might get shot any day, the logistics of protecting the gun (do the teachers carry the guns, gun safe, what if a kid steals a gun, what if there's an accidental discharge, what if a teacher shoots the wrong kids on accident?), teachers being more on edge being forced into a protector role and now seeing every student as a possible threat, etc.
There is no world where arming teachers should be the first idea, or anyone should think it's reasonable at all.
That's not what a resource officer signs up for and is trained to do. They aren't cowboys protecting the farm. They're primarily used to break up fights and be good role models, not go chasing down shooters.