I think everyone is freaking out about the headline unnecessarily here. From the first paragraph:
has started to implement a new policy to ban content that glorifies and incites violence, and among the first to go were forums for Nazi, racist and white supremacist groups.
They aren't banning Nazis because they are Nazis. They are banning Nazis that glorify or incite violence. And anyone else that glorifies or incites violence. A quick look at /r/blacklivesmatter shows no posts of that nature, but I'm willing to be corrected.
There are circumstances where violence is the only answer. Look at the Arab Spring. In hindsight, Egypt did not fix the fundamental social issues that led to their revolution, but they were faced with a tyrant dictator butchering people in the streets in 2011.
Almost all modern democracies came about through violent disposition of monarchies or dictators, and we only consider those good revolutions vs Nazi revolution or communist revolution being bad because, usually, people only want violence done to prevent violence in the future by the aforementioned murderers on the throne. IE, defend yourself or your neighbor and you are in the right, but if you overthrow the mob just to create your own mafia you are in the wrong.
Look at Catalonia now. Take away political ideology and ask the question - if a majority of Catalonians want independence (and that is a big if), and the Spanish government brings troops to bear upon them, is it immoral of them to organize their own army to fight back? That is inciting violence, but it is in the exact same capacity as revolutions for centuries were organized to overthrow regimes deemed undemocratic or unrepresentative of a people.
Not to say all revolutions are good. The American Confederacy was abjectly bad because their motivation for secession was to continue to own human beings as property. Or how Caesar overthrew the Roman Senate to become a tyrant himself. But unless you categorize the American, French, Spanish, etc revolutions of their times as all being "bad" because they were "inciting violence" then it is not a black and white issue where you can just say "we ban the inciting of violence because were being moral" and wipe your hands clean of it. Its way more complicated than that.
has started to implement a new policy to ban content that glorifies and incites violence, and among the first to go were forums for Nazi, racist and white supremacist groups.
They aren't banning Nazis because they are Nazis. They are banning Nazis that glorify or incite violence. And anyone else that glorifies or incites violence. A quick look at /r/blacklivesmatter shows no posts of that nature, but I'm willing to be corrected.