I'm of the view that we need more powerful users, not moderation. Would be hard to enforce I suppose, given voting rings and whatnot, but I'd like to see a community like that one day.
Of course, reddit doesn't do that either nowadays. But the point stands: Blocking bot behavior does not necessarily mean blocking real users.
Also, what's wrong with pushing an agenda exactly? Are we to ban politicians and opinion writers?
Bots exactly misrepresent the will of the public.