[rndgermandude]

Well, I didn't make this argument specifically here, and my answer would be: it depends.

Common carriers, like Telstra (largest mobile Australian ISP), started blocking websites hosting the video. That's not OK for an ISP to do. Same as it isn't OK for e.g. a utility company to cut off power to a "nazi" (whatever that means these days) or to Bernie Sanders supporters because the utility CEO doesn't like "socialism".

Private entities actually hosting the content would be a different matter, and the decision should be up to the private entity. Unless such a private entity is a de facto common carrier in itself. I'd argue Facebook, twitter, reddit, google e.g. are de facto common carriers running general purpose platforms - given their size, influence and reach - even according to their own PR. They are analogous to a utility company, and saying "you can host the content on your own server" is like saying "you can just run your own generator for your electricity needs/use solar panels and battery" or like saying "you can always create your own telephone network if you don't like what the companies are doing; all it takes is 2 old cans and a string".

In my opinion common carrier and de facto common carriers should not be allowed to outright censor lawful content. Videos of newsworthy terrorist attacks, no matter if it is made by a terrorist (e.g. this one) or just an innocent bystander (e.g. 9/11, Las Vegas), are not illegal and should not be allowed to be censored by such de facto common carriers/de facto utility companies.