I don't think it's any one group's fault. Everyone has been getting progressively more stressed - the parents, the kids, the teachers, and even administrators. Budgets are getting tighter. Teachers and school administrators are being paid less and there is more expected of them. It all contributes.

If you need someone to blame, blame the ultra wealthy. They are hoarding all of the money, propagandizing us against each other, ignoring existential threats, demanding fewer taxes, and push for longer hours for the rest of us.