In many other communities, information is judged dangerous for various reasons and censorship is directly related to self-protection of the family, tribe or village. Censorship can be political, sexual, moral, religious, military, commercial. A mere generation or two ago, the U.S. banned Henry Miller, the U.K. James Joyce.
Democracies are as prone to censorship as any other political form.
When our governments feel threatened, they use censorship extensively and brutally. Massively dumping loads of exotic data on unprepared populations may well be truly dangerous for them, and it is understandable that their governments react the way they do. But to do that, we will probably have to rethink part of our own approach to the question. There is also the matter of commercial censorship. I'm not saying that witholding information for financial reasons is wrong, only that it too is censorship, and widely practiced in the West.