What if they are so intent on looking cool or knowledgeable or whatever it is they are trying to "look" that other posters watch them just tear in to posters over and over to the point that on one can concentrate on the actual topic?
You're asking about how a community should respond to abusive and/or needlessly disruptive behavior. In the case of JWN that falls squarely to the sights ownership to do with as it pleases. Those of us who are not owners can, if it is allowed, share our opinion with the sights ownership. But basically each person has to decide if they want to subject themselves to whatever is allowed in the given community, which in this case is JWN.
Frankly, I'm perfectly happy with a wide open forum because I'm perfectly happy to let educated readers decide as they will based on what is put before them. This was how the original H2O functioned, and I found it useful that way. What fools make of things, do or say is not something I tend to worry about, unless their actions present an imminent threat to my person or family.
But I can function in this comparatively tame environment.