You're assuming that the purpose of the public education system in the US is student education. The observed behavior suggests otherwise. I said lobbyists and

You're assuming that the purpose of the public education system in the US is student education. The observed behavior suggests otherwise. I said lobbyists and teachers organizations, but teachers support them.... And, when evaluation comes up for a vote, teachers vote against it overwhelmingly. They strike to get rid of it, and so on. There are no technical solutions to social problems.