Historical facts can be established to a sufficient degree to be taught to schoolchildren  For most post-medieval periods, it is possible to establish such "facts" with a very high degree of probability. To take the Holocaust as an example, fears of the events being erased out of history books drove Dwight Eisenhower to travel to Germany to witness the aftermath first-hand. The future American President was driven by a desire to be able to 'testify at first hand about these things in case there ever grew up at home the belief that the stories of Nazi brutality were just propaganda'1. Furthermore, even if the historical facts are not as clearly evident as the Holocaust, and have to be simplified, this need not be "intellectually dangerous": it is impossible to prove that a real harm results from only knowing the academically dominant interpretation of a historical episode, even if it might be theoretically desirable to consider minority viewpoints too. Indeed, all school teaching involves simplification and generalization: much school science teaching entails discussion of how general rules (learned earlier during a pupil's school career) are not always applicable. 1 Chapel, Joseph. "Denying Genocide: The Evolution of the Denial of the Holocaust and the Nanking Massacre." University of California: Santa Barbara. May 2004. (accessed July 14, 2011).