From what I see, talking to friends, etc. Most people stay out of the forums due to things such as, trolls, abusive, childish, insulting people. Some people seem to go out of their way to ridicul people when they suggest or say something that the other person does not like. The conversation starts off normal and polite, then one of these types will come in and intentionaly start some kind of argument, or post an aggressive reply that does nothing but ruin the thread. Instead of posting why they do not agree in a calm, mature way, they simply state things like ''thats stupid'', ''worst idea ever'', they post replies that are aggressive in nature, or replies that are a complete strech in relation to what the OP was trying to say, etc, causing the posts to quickly become aggressive, childish, and completely non productive. We know why trolls do it, but with the others I believe that it is that they lack the ability to admit being wrong, then when someone posts, or replies with something that is hard to discredit, they go on the offensive, and unfourtunatly, there are quite a few people in these forums that enjoy seeing that happen, kind of like the crowd that gathers and chants FIGHT FIGHT around 2 people fighting, which leads to the ''one line'' responses that encourages the offender to continue, and repeat the behaviour on other threads as well. They could also simply be children, or immature adults that lack the mental maturity to interact in a proper adult mannor. When I am reading a post or reply, as soon as I see a childish, out right abusive, or insulting remark, then I stop reading, even if I'm only on the 1st line of a wall of text reply, and as far as I am concerned, the conversation, or back and forth with that person is over.
We have moderators in here that are supposed to stop things like this from happening, but the only time I see a moderator do their job is when someone posts a screen shot of a glitch, other than that, they do nothing, or at least, very little to keep the forums clean. IMO, as soon as someone posts any sort of insulting, childish, aggressive, or abusive reply, the moderator should delete it and warn the poster about their behavior. I think such constant policing of the forums would help bring more people into them. If the Moderators are to busy, then they should consider asking some of the more rational regulars here if they would be intrested in the job.
There are a few people in here that I believe would be good at the job, such as Undedd Jester, and Scary Ghost, just to name two off the top of my head.