When law enforcement professionals respond to an active shooter / killer event, sometimes distinguishing between the good guys and bad guys is a challenge.
In the majority of states in our country, there are a plethora of legally licensed concealed carry permit holders. If they respond to an active shooter / active killer event, ...
The least impactful active shooter / killer events are the ones that are stopped the fastest - usually by an immediate responder in the room or on the scene.