Personally, I am coming to A2K for debates. I think we have quite a few A2Kers who don't actually want that. Or more precisely, they want to shut down those debates that don't go the directionthey like. And they use nastiness to do that.
The nastiness is a problem, not the discussion. If everyone could keep his or her cool, and opt to ignore those debates they don;t want to take part in rather than try to silence them, this would be a better place.