Comment: They wouldn't have even had to have had concealed carry.

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In reply to comment: I wonder... (see in situ)

They wouldn't have even had to have had concealed carry.

If the teachers had rushed these two "gunmen" and beat the crap out of them or stabbed the gun-weilding assailants with letter openers, scissors, or bashed in their skulls with some heavy object within grasp, this could've also had a very ugly ending.

You're right that there is an obvious perception of gun free zones as helpless victim zones....and if the cops know they're helpless victims, the criminals will as well.