Experience tells us that, if you cage an animal for an extended period of time and direct negative pressure towards it. The animal will eventually break and go wild on the owner. Schools and the education systems have failed the students.
Students have been treated like cattle for far too long. And when they stampede, we the public react in surprise and quickly go on a blaming spree. What we are currently seeing is the effects of a complete failure in the current system of education. The effect, meets cause.