because criminals aren't allowed to use guns in them.
That's the way it works... Right?
Edit: Okay, to clarify for the MORONS out there. OBVIOUSLY you have to have a concealed carry permit to even have a gun in public which is unobtainable for anyone under 21. So CLEARLY a student WOULD NOT be allowed to own a gun ANYWHERE in public ESPECIALLY at school.
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Yeah I know this is sarcasm by you OP but to people that actually believe in it, they better move to Chicago because its a gun free zone and its super safe y'know.