Just preparing the little mush skulls for their roles as Dhimmis in the new Greater Eurabian Caliphate.
Most of the parents probably go right along with the propaganda. Few wish to rock the boat.
When I was in school most of my social studies/history teachers were liberal leaning, BUT they did encourage us to civilly debate the issues of the day (Vietnam, Watergate, etc) as well as becoming informed from different sources and THINKING FOR OURSELVES.