I think Rick has a good point here.
Teachers are very oppressed as a professional group.
They get all the blame but almost no gratitude. Teachers are the scapegoats of the oppressing society we live in, just like parents. Teachers have quite limited freedom to do as they would like to do. I believe teachers know this by heart, but they aren't given this information and thus they struggle to do their job as they are told hoping to do at least something right. Teachers are oppressed.