Students that support carry should mass together and all wear empty holsters to school as a valid method of protest. The po po turing up and taking one fella away is a little easier than turning up and taking away 200.
It could make some converts.
Rebellion is Nature's Way of turning kids into adults.
Youth will tend to oppose the "Oppressive Establishment" (after all, the Oppressive Establishment has been making them eat there veggies and clean their room for some 18 years now) and follow "Enlightened Leaders". This is how BHO got a lot of the youth vote and how educators influence them....by supporting the suppressed and downtrodden....
"Give me your tired, your poor,
Your huddled masses yearning to breathe free,
The wretched refuse of your teeming shore.
Send these, the homeless, tempest-tossed to me,
I lift my lamp beside the golden door!"... from the plaque mounted in the interior of the Statue of Liberty.
But, when they see the Enlightened Leaders acting like an Oppressive Establishment, particularly to their peer group, they may well have second thoughts.