If you have a thread about politics it is inevitable it will be divisive. It is the nature of the beast. To phrase a posting in such a way that no other view is allowed, to be deliberately provocative, or to insult the opposition is going to send any thread to the dogs, as is intentionally drifting way off topic. Some take pleasure in pissing people off unfortunately, others like to air their supposed superiority,
some get their kicks from honing in or grammatical errors or spelling mistakes. It takes all sorts to tango.