Re: The Paradox of Tolerance summarizes my opinion:
I'll concede that behaviour (i.e. doing things) needs to be regulated, but the only test for speech should be where it is either calumny (calculated, lying libel) or uttered with reckless disregard as to whether or not it is true.
The problem is, a website is not only a place to speak; it may also serve as a means of instigating violence. DS has shown a predilection to do that. Of course, they're subtle, to avoid clearly breaking the law. But there are plenty of ways to drive the easily manipulated to violence. I think the nutjob who killed the protester in Charlottesville was one of the easily manipulated. The DS's response to the murder does nothing to change my mind. We should keep the situation of DS in its context.