I wonder why you got voted down. I'd rather see a counter-argument to this than a greying of it.
Of course, the burden of justifying cutting out speech falls on those with the power and ability to do it. Today we all agree that white supremacy is evil and so on.
But in the 1950s half of America didn't mind that the other half had fingers pointing at them that they were communists. Jobs were lost, reputations sullied, jailtime given. It felt really righteous at the time, because, it was said, the communists were traitors and even potentially spies. A police state was established, perhaps not as severe as that of Soviet Russia or East Germany, but a surveillance state nonetheless.
During World War I we passed the Sedition Act, which made it a jailable, criminal offense to oppose World War I.
Go ahead, let's pile it on the white supremacists. But what happens when the same forces come for you? The same precedent: to protect the public, your views will have to go underground.
I speak as someone who is for all intents and purposes anti-fascist. However, I also speak as someone who recognizes that technology can make a far more repressive dystopia of limited ideas than Fascism of the 1930s was able to achieve.
I wish people had a better reading of history before they beat their chests with this shut down of hate speech.