I've only posted a couple of times in the PPR section, though I'm sure I'll make more use of it in due course, as those issues interest me a great deal.
Quite honestly, I do not find the robust, and occasionally aggressive, exchange of views which can take place there, to be particularly undesirable. There would be something wrong if these topics did not generate a fair bit of heat, as well as light, and it should be no surprise that people of an aspie disposition, with a tendency towards "black and white" thinking, should interact in this way.
I would feel no personal animosity towards a person who emphatically, or even a little abusively, disagreed with a position I might take on a political or religious issue, and would hope that might apply both ways.
I would prefer it if someone described a view of mine as "idiotic", rather than calling me an "idiot" for holding it, but it wouldn't necessarily be that big a deal, if he or she gave interesting reasons for saying so. On the other hand, insults containing obscenities, or making demeaning references to a person's ethnic origins, or a disability, should not be acceptable.
I regularly read and participate in the "Comment" section of the Daily Telegraph, a supposedly "quality" British newspaper, and believe me the stuff in the WP PPR section is very moderate compared to some of that!
I think that removal of comments and locking of threads should not occur as frequently as they do, by the way.