Hi Titus,
I understand your position on PvP, and I understand that it frustrates you when you see that people are seemingly trying to undermine it. I get the same feeling when people talk (in a less than informed manner) about the DDF. In the same way as some people don't "get" the game, I don't think you're "getting" the DDF.
The DDF has been nothing other than beneficial for the game that you're testing right now. There is a good spread of opinion about most of the game mechanics, and that includes PvP. There has been no discussion as such about whether PvP is a good thing or a bad thing, simply an acceptance that in order to make the game fun, allowing people to opt out is a good compromise. The discussions on griefing have centred around what could / should be done to both detect it and punish it. The dev opinion on that was always that they'd prefer for the game to do it automatically; i.e. if there are mechanisms in-game that allow you to grief someone, then the game should come down hard on those actions. Not through moderator intervention, but through natural gameplay such as fines, bounties and reputation. The complaints we've seen in the forum about PvP are simply because those mechanisms aren't in place, so the balance is tipped toward the griefer. The only real consensus was that there should be some way of reporting abusive behaviour, and that's in the game already.
I understand why the Freeport shenanigans were odious to some people: without living on the forum, they likely wouldn't have known about the "consensual" agreement that was in place (in which case, they just see people exploiting the NFZ bug and have a rant about it). It frustrated me a little that once the bug had been identified, those players didn't just ticket it and move on, but I also realise that it was valuable for the devs as it gives them an insight into what sort of gameplay would emerge when there aren't consequences. We saw vigilante action, exploits of the solo mode to avoid the blockade, etc.
Anyway, back to the DDF. The main thrust of the DDF has always been to find and fix the holes in Frontier's design for the game. While some posters are more vocal than others, I trust the devs to treat each argument with the same merit. The great thing about the vocal posters is that they were able to debate, make proposals and refine those proposals until (sometimes) something good came out of it. If the DDF hadn't been there, this game wouldn't be anywhere near as far along as it is now, as Frontier would have had to iterate the design more during the early phases. If they'd implemented in-system travel as per the original design, it might even have killed the game before it started.
The reason the DDF isn't very active right now is that there aren't many topics being posted. We occasionally get a promise of a new one, but it seems that Sandro is very busy so they're few and far between; in fact, since the Alpha was released there have been relatively few topics broached. It's amusing to think that at one point we were expecting a topic on the flight model, but that ship has long since sailed! There will come a time when Frontier are ready to look at new features (either for the expansions or for updates post-release), and I'm sure that a lot of us in the DDF will become active again.
Finally, don't worry about the DDF input to the PvP debate. DB wants this to be a multiplayer experience, and he wants it to be (for want of a better term) dangerous. PvP will be a big part of the game if you want it to be. Likewise, if you don't, it won't. That's got to be a good thing, right?