And the resistance of the media to point it out:

In each of these cases a killer is stopped the moment he faces armed resistance. It is clear that in three of these cases the shooter intended to continue his killing spree. In the fourth case, Andrew Wurst, it is not immediately apparent whether he intended to keep shooting or not since he was apprehended by the restaurant owner leaving the scene.

Three of these cases involved armed resistance by students, faculty or civilians. In one case the armed resistance was from an off-duty police officer in a city where he had no legal authority and where he was carrying his weapon in violation of the mall