"I wonder if there are really schools where teachers could get by showing this kind of propaganda..."
Yes. Before the election there was outrage by parents at a Jacksonville Florida school where one of the "teachers" showed Fahrenheit 911 to his class. Liberal teachers will stop at nothing to indoctrinate kids.
A couple of teachers here in "conservative" east Tenn. showed this film in class and were reprimanded for showing an "R" rated film to kids under 18.