Of course. That is the simplicity of the arguement against the gun-grabbers, which they can't understand in their mindless "feelings" to build an unattainable Utopia.
More simply stated:
Got gun? I have one too! You want to kill a bunch of people, I will kill you first! Your plan is dead and so are you!
The question is not a simple one (except from the concept of the absolute right in the constitution to own a weapon).
It is clear that, in a situation like this, having armed people in each classroom would have ended this sooner.
But what is not clear is how many people might have been killed by guns after minor traffic accidents, fights over women, normal violent behavior at school, if a lot of kids had guns readily available. I’m not saying there is ANY evidence that having guns available WOULD lead to them being used in these other situations, just that it is not without merit to think about it.