You're assuming psycho / sociopaths have a good grasp of indoor combat tactics. Some of these guys don't even realise they can shoot through wooden doors. Often when you read accounts of spree killers encountering locked doors their solution was to bang on the door and demand the occupants open it, because they're that far gone that they think they have a right to kill those people.
Plus, commercially available shotguns tend to be a bit on the big side.
Last edited by Evil Tim; 10-06-2015 at 09:24 AM.
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