There is an essay on the website of the Newyorker and it’s a mustread by David Denby: Stop Humiliating Teachers.
2 excerpts just to convince you to read the whole piece and that illustrate 2 of the central thoughts:
There’s an element of this rage at bad teachers that’s hard to talk about, and so it’s often avoided: the dismaying truth that we don’t know how to educate poor inner-city and rural kids in this country. In particular, we don’t know how to educate African-American boys, who, according to the Schott Foundation for Public Education, graduate high school at rates no better than fifty-nine per cent. Yet if students from poor families persistently fail to score well, if they fail to finish high school in sufficient numbers, and if those who graduate are unable, in many cases, to finish college, teachers alone can hardly be at fault. Neither the schools nor the teachers created the children or the society around them: the schools and the teachers must do their best with the kids they are given.
Everyone celebrates his or her personal memory of individual teachers, yet, as a culture, we snap at the run-down heels of the profession.