I'm guessing that there are in fact very few gransnetters who are confident enough to post what might be seen as controversial views without thinking carefully beforehand about what they want to say. I have come across very little that I would call arrogant. Sometimes there is careless posting, or hasty posting, or impassioned posting (I plead guilty to them all and more), but very, very few actually set out to cause problems for others.
It's easy, also, I think, to view a strong argument (by which I mean logically strong, or rhetorically strong) as being dominant, especially when it conflicts with one's own view, but it need not be (and rarely is, in my view, from what I've seen on here) driven by a need to dominate so much, as a desire to have a bloody good discussion about something.
And so, in response to Alison's last post, I'm glad people support your challenges. That certainly isn't a problem as far as I'm concerned, and I don't regard it as cliquey. I don't think there are any cliques. Most people seem pretty pally to me.