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If someone had a CCW License they might have more experience with the ability of knowing where the shot came from.
It's also possible that one of these times, someone with a CCW license will be within running distance to where the killer is and that person might be able to get to the killer before the killer sees that person. It already happened exactly like that during one of the school shootings and the killer tried to drive away. The vice Principal retrieved his gun from the car and pulled the killer from the car.
There is also the idea that every cop in the nation has a handgun on him. We aren't going to send them all home, are we?