The harm happens in the minutes before an armed response arrives

The argument

The case for armed guards in schools rests on the structure of the event it is meant to address. Proponents argue that an attack on a school is decided in a short interval: the time between the first shot and the arrival of someone able to stop it. During that interval an attacker faces no opposition, and proponents argue that everything which determines how many people are hurt happens inside it. Calling for help does not shorten the interval; having someone already present does. The mechanism proponents emphasise is proximity rather than firepower. An armed officer on site is not expected to win a gun battle but to interrupt one, because an attacker who must deal with return fire stops advancing through classrooms, and proponents argue that interruption is what saves people even where the officer is outmatched. Proponents add that the same presence can deter before anything begins, since an attacker choosing a target has reason to prefer a place where no one will shoot back, and that this effect is invisible when it works. Proponents argue that the objection from risk misstates the comparison. The relevant question is not whether an armed guard introduces danger, which proponents accept it does, but whether that danger is smaller than the danger of having no armed response for the length of a police journey. Proponents argue that every other place where mass casualties are thought possible, including courts, airports and government buildings, is already protected this way, and that it is schools which are the anomaly. On this account arming a trained guard is the ordinary precaution applied to the one setting that has been left without it.

Premises

Counter-arguments

Opponents argue that the comparison with courts and airports fails because those places screen everyone entering and have no children in them, so the armed presence operates in a controlled setting rather than among thousands of pupils moving between classes. They add that the premise assumes the guard performs as intended, when an attack is chaotic, brief and unexpected, and the guard may be elsewhere in a large building, unable to identify the attacker, or targeted first. The deterrent claim, meanwhile, is untestable: an attacker indifferent to their own survival is not deterred by return fire.

Rejecting the premises

[Rejecting P1] Attacks vary in duration and course, so the premise generalises from one pattern to a class of events that does not reliably follow it. [Rejecting P2] A guard in a large building may be far from the incident, unable to identify the attacker, or targeted first, so presence does not reliably shorten the interval. [Rejecting P3] Courts and airports screen everyone entering and contain no children, so the armed presence there operates in conditions a school cannot reproduce. [Rejecting C] At most the premises show that a faster armed response would help, which is consistent with achieving it by means other than stationing armed guards among pupils.