Banning media is not exactly banning an ideology -- and even if the films were released, Nazism would still be banned in Germany.<p>The banning of ideologies is connected, more or less, to banning movements. In the 1870s, for example, the KKK was declared to be a terrorist organization and disbanded. (Though this change was not permanent.) Was their ideology banned? At least in practice it was, since any demonstration of affiliation with the KKK was essentially painting a target on oneself.<p>The government in practice is often corrupt; yet it often does what is in people&#x27;s best interests. It contributes to public safety in many ways even as it undermines and confuses it in others -- we&#x27;ll have a lot of trouble to find a government that is so clearly in either of the forms you outline. The question of whether a government should ban certain ideologies does come down, in part, to the ideologies themselves. Nazism isn&#x27;t banned because it is merely &quot;bad&quot; but because its followers did bad things: acts of utter moral depravity. No one wants to see that organization re-emerge.