Erasmus of Rotterdam (1466-1536), Dutch Renaissance humanist:"To what corner of the world do they not fly, these swarms of new books?"
I think people were concerned about that kind of scenario since the invention of the printing press, if not the written word itself. Not trying to dismiss the destructive potential the Internet can and will have in the future, just pointing out, that this kind of fear is not new.
Hitler was a young man at that time, don't forget that. ~~Time~~ History doesn't repeat itself but it rhymes.