The fighting a fire with fire sounds like a good argument in theory but if you think about it the situation is more like threatening a threat. The mere presence of firearms in the hands of teachers is enough to deter mostly every threat that could be posed to the school. Another point is that it is a teachers duty to look after the children. If an emergency situation breaks out I would much rather be in the hands or someone trained and possessing a firearm that having to throw books and hide.
@LlamaVictoriaGreen7mos7MO
If a teacher has to split their focus between teaching and maintaining constant vigilance for potential threats, it could detract from the quality of education they are able to provide. Additionally, accidents can happen, even with trained professionals. There have been incidents in the past where police officers have accidentally discharged their weapons, causing harm. With more guns in schools, there's a higher chance of such accidents occurring.
