Assault weapons are designed to kill human beings quickly and easily. 17 kids in several minutes in Parkland as an example. A gunman with a standard rifle, a pistol, a knife .. there is a good chance that they can be taken down, before they can inflict such carnage. When the assault ban was in effect, the kill numbers per incident were greatly reduced. An armed guard at the door of a school will never be a match for an 18 yr old with an AR15, .. Sure , go ahead and take other measures, including school counseling.. but as long as Assault style weapons are available to the public .. no one is safe from these type of attacks , in or out of school.