No real need for swearing, Dreamtwister.
I think there are a few factors here. As others have noted, people these days have plenty of other means to discuss, argue, vent or insult - ten years ago, this was really the first well-structured discussion forum many of us had seen. Also, the world's politics are perhaps less polarising than they were 10 years ago.
I still like the forums but almost entirely for running-related matters, which is really what it's here for.