I think very few teachers would want to carry a gun at school. If you do the math, you'll see the chance of a teacher ever being faced with a shooting situation during their 30 year career is very small. For most teachers, the concern that a student might get hold of the gun or they would make a mistake or misinterpret the situation and kill an innocent child is enough for most teachers to say no to guns in schools.
IMHO, firearms at schools should be left to trained professionals: School Resource Officers (SROs) and school police department officers. The vast majority of teachers want to be armed with textbooks and computers, not guns.
First...the main point is removing the gun free zone status......Ben shapiro on his daily wire podcast talked about going to Jewish school as a kid. They had a mass shooter scope out their school....he saw armed security and chose a different Jewish school to attack.
Getting rid of the gun free zone let's killers know they likely will meet armed resistance...and as I keep telling you guys, the shooters who lived, and the shooters who left notes say the same thing......they chose different targets when they realized their initial targets would have armed security or were gun free zones where they might encounter armed citizens....
And you wouldn't need to arm teachers, you have secretaries, principles, and other staff without as much direct, hour to hour contact with students who could be trained......and again, the major deterrent is just letting shooters know the building is no longer a gun free zone.