"ostracism (no pun intended)" that's a pity because it would have been a good one.
Regarding your post. Firstly and most importantly, Osvaldorama didn't get banned because he broke any forum rules. Apparently he had "ruined the level of debate". The level of debate on a thread where fish and cheese puns are regarded as hilarious wasn't exactly a high bar in the first place. But if everyone can be honest for just a minute, we can all see he has really been banned because his views went against what the majority on here want to hear. A thread that was started under the guise of hearing different political opinions has become intolerant to dissent. The result of that is what we have seen today, censorship pure and simple.
There is no doubt, going by how other posters are excused, that if his views were on the left he would still be posting. As for taking over the thread, have a look at who posts all day, every day and seems to consider themselves the mouthpiece of not606, you might come up with a different name(s).
You're right in the respect of if there was no politics thread this board would be more harmonious but at the moment it's more entertaining than the football. Interestingly, I never used to post on here but it was a comment by Thumwood a few years ago that provoked me into replying. You can blame him for that.