I agree with Kahran entirely. Suppressing the past is, to me, just as bad as suppressing factual reporting of the present. It condemns us to relive past mistakes, and condemns us to cultural chauvinism by shielding our eyes from our ancestors' wickedness and folly.
I find the notion that historical monuments should be transferred to "museums" (presumably galleried buildings) to be particularly worrying. Why should this be done? It would remove the past from the view of everyone who was not determined to actively seek it out. The public are uneducated and complacent enough without the presence of history being removed from their daily lives. Who would determine when something had become "history", or when it was "offensive", thus condemning it to concealment from the public gaze? That seems analogous to book burning, and certainly no better than the role of the state as arbiter of public taste in countries like Iran. Another consideration is that many historical monuments have a position in the landscape which is essential to a proper understanding and appreciation of them. Experiencing the past in its proper context can be a transformative experience for those who have only a casual interest in history.