I hope you can find a lively forum that fits your needs. As it is MDC and its forums are about all I can keep up with. Honestly, even though I love a good debate, I often tire of the same debates over and over again. Between schoolers/ homeschoolers, between homeschoolers/ unschoolers. The areas of disagreement are relatively limited, so the debate is limited as well. Same for the BM/ formula, vax/unvax, veg/ omnivore, SAHP/working parent, spanking/ GD, abortion/ choice debates, these are all limited in their scope. The same arguments come up over and over and over. To resurrect a tired phrase: been there, done that. These debates for me are dead ends. (They are nothing like the old-fashioned face-to-face, caffeine and cigarette and psychedelic-influenced coffeehouse debates that veer in every direction, without limits on topics or anything.) I don't mind debating them when they come up, as I love a good one, but I don't go seeking it. By then my eyes are bugging out on the computer screen and it's bedtime, dinnertime, dh-time, or playtime. Little time for this.
The other reason is that I am a relatively confident unschooling parent. For better or for worse, my mother left me with the legacy of do-it-yourself-or-perish. I am comfortable figuring things out on my own. It's fun. Yoga, aikido, all these are internal explorations of my body and my mind. I love having teachers there, and I love having some experienced unschooling mamas around to seek advice from when I need it, but my personal needs on the matter are limited. And honestly? I could care less if a radical unschooling parent has a kool-aid-and-potato-chip-driven-24-hr-online-gamer at home. Or 10 flag-saluting-creationism-curriculum-school-at-home-kids either.
Doesn't mean that it's not amusing when threads get lively, but personally it's not what I'm here for.