Well, discussion boards, like any public forum only exist for about a third of all gamers. Like nearly anything else: a third of people just don't care(have not and never ever will log on to ENworld.); a third care a bit (make an account, maybe make a post, maybe log n once a week or month or so, but mostly lurk) and the last third have strong options they wish to share (and log in often and post often).
So online, you really only get the extreme end of viewpoints of a third of people: the other two thirds don't care, or don't care enough to say anything. You do see it in real life too, like sports fans: a third like sports and watch "the game" but don't care much who wins of looses; a third follow sports news and watch the game and care if their team looses...but does not feel the need to talk about it much most of the time; and the last third is immersed in sports 24/7 and was screaming and throwing things while watching the game on TV, cares more about sports then nearly anything else and can't WAIT to corner and talk to ANYONE about THAT game for the next week or so.
The vast majority of mature gamers, in real life practice the idea that they will, mostly silently, follow a DM's pr groups "house rules", EVEN if they don't like them at all. Some players are so desperate to play in a game that they can ignore any style or house rule or whatever.
Not everyone can always come together, but many can.