It was a good run but that seems to be the natural progression of any highly-trafficked discussion forum, first you get the migration (at that time from Digg) of the first adopters, usually relatively open-minded and civil. Then the mass adoption gathers steam and the low-hanging extremists (both left and right wings) drop their markers and shit all over the place. Cue the next migration of sane minds to the next untarnished forum.