If we examine most of troubled pasts presented in educational scenarios, two features clearly appear. Most of the historical events have a national character and most of them happend just recently.
5 (2017) 1 
Value Neutrality? Repression of a Crucial Question
For Western historiography and with it the descriptive parts of history textbooks have to be sine ira et studio nowadays. Value neutrality is a necessary prerequisite for history as a science.