Only the ones that let them stay, really.
I feel like there's a balance to be struck between free speech and censorship. Clearly, these people do not represent the spirit of Hubski. Lurking briefly on the site reveals this. Shy of having some "global mute" function, an analogue to this description of "global filter", there's no way to completely censor them. And if Hubski did, they'd just make another account and start over. An open and popular forum will eventually expose all the evils of humanity, as featured by users' comments themselves. It was here fairly often even before the recent influx, and unfortunately, I don't think it's going away. The moderation tools given to me seem to suffice for now, but we're not the same person. Neither have we payed Hubski a cent. Yet. Please try not to interpret this as me advocating for them or against you. Neither was my intent.