The difference is that Hitler was open about his intention to censor anti-white poison [see his Mein Kampf etc.,] , while liberals claim to "welcome the expression of new ideas".
Nietzsche himself advocated the burning of books, so censorship is part of the war of ideas; it is only liberals that pretend that they are against censorship, while they stealthily practise it. One strategy liberals use is 'the cold shoulder', where they seek to censor by silence and avoidance -
They cannot argue the ideas because THEY have none!
CENSORSHIP IS THEIR ONLY WEAPON!