[Government] need[s] to be able to maintain order or else [citizens] can't learn. If the [citizens] have no respect for the [Government's] authority, they can't maintain order. Therefore, anything a [Citizen] does that causes other [Citizen's] to lose respect for their [Government] must be punished. The alternative is to have a situation where classes are completely out of control and the [citizen] who want to learn, can't.
Remember. Most school teachers are government employees.