Edit: I didn't want to litter the thread with copypaste, but my reply to the same question from another user was:

  In 1960s Germany, students where so outraged by the absence of Nazism from their history curriculum that they turned violent. They rioted, bombed, and killed because they felt they where being denied their right to learn their recent history. And they blamed this on the fact that their teachers and parents had been Nazis and thought they where trying to erase their crimes. In a flash of cruel irony, the state's desire to shelter the students from political violence ignited it again in the streets and in the hearts of their students.