Nah, it's not an issue of posters. There will always be all kinds of views on any one issue. The only educator to shape a calmer, more precise man or woman is life itself. That takes years of tangible experience that personally affects fortunes. Not a bunch of well-meaning / self important / ... lads on a forum.
You can play it 2 ways. It can be a place where anyone is free to state their views, abuse gets banning, then watch what transpires. Chances are, you'll end up with a place with a lot of moaning, some uberpositive psychos, some fucks who spend most of their posts muttering 'this RAWK, this poster, that troll' and a good number of sensible, calm lads. That's not uncommon, I think that's the most repetitive pattern you'll see when you get a bunch of people together, that's life.
Another way is you try to control the end product - can't discuss this, can't post that. A certain level of this is required to keep control, but where you draw the line is a fine balance.
But the key question for me is, if a guy has a certain view on things that jars a lot with yours, what is stopping you from just skipping it and going to the next message. Saying no, this player was in this position, you've got it wrong etc is discussion. Telling a guy to get a backbone, blah blah blah that's just pointless talk and does nothing, usually an indulgence for bossy darlings who can't get their kicks in life itself. You don't like a guy's attitude to life, his personal take on things, let it go. The highlighting of :THIS IS HOW YOU MUST APPROACH A GAME / CHALLENGE / LIFE (when we know sweet fuck all about how successful or a failure you are where it matters) is as much a problem, hell sometimes a bigger one than the negative posts.