Historically, some national history museums have been used purely as propaganda tools through which governments attempt to convey an official history. For example, "the Nazi regime employed the museum as a deliberate tool of propaganda and 'public education'". It has further been argued that "the very idea of an officially sponsored national history museum is simply outdated" in light of the trend towards pluralistic interpretation of artifacts. On the other hand, it has been argued that: "To create a national history museum that discards unitary national narratives as well as causal trajectories (the teleology of the nation)—in effect to subvert the form—is probably impossible". One concern of national history museums, therefore, is how to fairly and neutrally depict negative periods in a nation's own history.