Nothing wrong with "vehemence" Tom. It's a good quality.
The whole idea of an 'in-crowd' and 'out-crowd' is a bit of a red herring I think. There are no solid blocs. It all depends on what we're discussing. There are certain posters who tend to align with each other, it's true, but that's not unusual when politics are being discussed. But I don't think it's a sign of an 'in-crowd'. Sometimes folks end up in a majority, other times in a minority. I'm pretty much on my own, say, when it comes to defending the Coalition invasion of Afghanistan and the removal of the Taliban regime. On Charlie Hebdo there were a few dissenting voices from the majority (who believed in free speech and the right to offend people's ideas) but not many - which isn't surprising.