Xena, I think you have the answer right there. Most threads are open for 'civil' discussion; but there are always one or two who can instigate and insult.

Also, there is a group of people who believe they are always right and cannot take a counter-argument, the reason why most threads turn hateful beyond a point.

And there are others (plead guilty) that feel it is best to ignore all the hateful, insulting posts and do not even bother to post.