They are trained in many more areas than just shooting a gun and that training is ongoing, they are required to pass tests regularly to make sure they can tell the difference between an unarmed bystander and a shooter. They are trained in negotiating situations with people, with crisis intervention. I also think they also get somewhat desenitized to the crime they witness. There's just no amount of training that could make me qualified to carry a gun on a school campus. None. Nor would I ever want that responsibility.