A forum where it is not censored by the moderators to such a degree as the rest of the site is.
I used to be a member of a musician's site that had a subforum like that. What happened to it, you might ask? The other subforums went almost dark. I actually just dropped by there for the first time in months. The latest post on all the other forums was last January. But if you log in, you can see the "political" and similar subforums (there are three). Those things are a hotbed of activity.
I've noticed here that even though it is a Christian forum, if you just select the "New Posts" tab, it's amazing how much of the activity is in political and "evolution vs creationism" threads. I go to other sites normally for that sort of thing, but even here, it is difficult to not go for the bait and get into them - and I sometimes do. The Rona ones are the hardest to avoid.
Fact is, most people that like to spend
a lot of time in forums are here to discuss controversial issues. That's the draw. I'm a member of a tractor forum, a lawn mower forum, a woodworking/tool forum and a Scion FR-S forum. I only go there when I'm having a problem and need a solution, or have fixed a problem, the solution to which I think others could benefit from seeing.
But political/cultural forums are for cage fighting. And it can be a lot of fun, but not really productive, other than as effective training for the REAL world. And it is that - in spades.