We've had really good debaters (no, not me but I pipe up sometimes), and still do have some who are sane-ish at it. The owner here was a very lucid debater when he participated in the forum. Most of us, I dare to think, appreciate considered debating. Some who show up here - it is a world wide web site - may be running into 'debating', or even lengthy discussing, for the first time.
Our problem is the insult culture, which I take as a chicken and egg setup that gets going and takes over. We also have a never-ever-shut-up problem.
(I post too much myself, but not usually all about one subject.)
There are also many (ok, some) who are quite dry with replies from time to time that may debate well in person but not want to get into a free for all here.
What ends up happening is this apparent division, smackdown or nicey. Many people here are more complicated, more interesting, than that if you get to know them.