That might be true for most, but in the past ideologies that push the harm or censorship of citizens have been incredibly destructive. E.g. book burning, eugenics, slavery, fascism...
It's not necessary to ban their study, but populations should 1st be taught how they caused societal backslides, stunted long-term growth and widespread, recurring violence in the past
if you turn it around, would all these violent ideologie have ground if everybody believes in the non-aggression principle? If not, what causes it?
