IMO there are speech that deserve censorship.
In 1934, fascists groups almost succeeded a coup in France, their own divisions being the reason why they did not take power. France was leaning the same way as Spain, Italy and Germany, but decision was taken to forbid fascists groups in 1936. In the end, France had its own fascist regime in 1940, but a military defeat had been required to get there.
Of course drawing the line between limiting the ability fascists ideas to spread, and abusive censorship is not easy and should be watched carefully by the people. But I do not think it should be bluntly discarded.. WWII taught us that some speech can really hurt beyond words