My bet is Disqus has neither the money nor the motivation to censor posts. On the other hand, giving their clients that ability would qualify as a feature. I would guess, in many cases, not having the ability to moderate would be a deal breaker.
I do know that once BB opened the LONDON section, Brit Mods, who are kinda liberal ( of all things ), were removing or not allowing posts to posts, that were very conservative.
Disqus provides the engine, the web sites provide the mods and obviously individual sites and different mods within those sites have different rules and tolerances.
Disqus solved a big problem ie it eliminated the need for commenters to register at every site. But it is a very flawed solution otherwise. For example, its threading model/implementation is poor.
Like so many monpolies, they have abused their power. Downvote totals are, inexplicably, no longer displayed. Supposedly enough downvotes will eliminate a post or flag it for mod review but who knows what the criteria are?
Even more inexplicably, there is no ignore/block function. For a single-login commenting engine that is used extensively across the internet, this borders on the insane considering the number of trolls that infest the ‘net.
But here’s the dirty little secret: web sites want to be ‘sticky.’ They want eyeballs, impressions, minutes spent, etc. because that means ad revenue. Troll battles are annoying and futile but they keep the hotheads returning to do battle for hours, even days, thus boosting web stats and ad revenue.
Facebook comments are hardly the solution, since a fake account for troll purposes is easy to establish and FB will do nothing to combat them even if they are led by the hand.
PS - I have never understood why Hot Air has not changed or improved its comment system. There are a small number of trolls there that derail every thread and, sadly, the HA users take the bait every time.