Just because you claim an argument is proven erroneous doesn't make it so. You just stated your opinions & then claimed they were facts or proof.
The fact is that I disagree with your assertion that students, who will always have the critical element of surprise on their side, would not make any teacher or staff member vulnerable to their surprise attack.
Let's take your arguments one at a time:
Why is your opinion better than mine?
I go back to my basic argument which is that children & firearms don;'t mix well & I can think of fewer more dangerous situations than having lightly trained , pseudo LEO's possessing firearms in a school setting.