What's one way to protest a school lunch period that's too short? Get a bunch of friends together and pay for your lunch in pennies.
Then watch the school administrators overreact to this blatant disrespect by assigning detentions to the students.
Then watch the school administrators backpeddle as fast as they can, caught in the public eye looking like petty martinets.
Most student "protests" are pathetic. This was actually reasonably intelligent and directly related to their grievance. An excellent teachable moment here--but the administration immediately went into battle mode. Was there no one to talk sense into those people before they made fools of themselves?