Because all of their workers are coordinating these actions with one another. That also explains why most of the comments around these political issues have tons of absurd pro-censorship stances on places like HN. They're the same people.
I'm wondering if this is not the result of the ultra loud vocal minority once again?
Having numbers doesn't equate to having equal or greater power.
This forum has been a place for corporate Libertarianism to flourish, and I have been here for a few years even though I am not the kind of user who gets alot of karma. I have never seen any very popular anarcho-libertarianism here, because it is not very profitable.