National socialism is objectively evil and is also not a religion so the example seems pretty far fetched to me. I could not care less about the feelings of nazis but Mein Kampf is important historical source material so it should definitely not be burned but instead preserved. I also think the impact of that book is generally overstated. Germans who voted for Hitler back then did not do so because of Mein Kampf but for several reasons including they felt the treaty of Versailles was unfair, that the new democratic system had failed them and because of the global economic crisis/inflation.
A civilized society does not necessarily require laws against offense in my opinion. Laws against incitement on the other hand are generally needed to keep things peaceful in most societies if you ask me.