@msolga,
I still don't totally get groups, but what I take from them so far is that they're not primarily a corralling sort of thing, but a way for members to have more control over their own discussions.
For example -- the Philforum people didn't like A2K's default moderation policies, and so Robert said, OK, I'll make a group for you that you guys can moderate the way you want it to be moderated.
I think that you, msolga, have also expressed some concerns with A2K's moderation policies (in terms of how much incivility is considered minimally acceptable). So you could (if you wanted) start something like an "Environmental Discussions" group, where you could have a bit more control over what happens in the discussion (and I'm not clear exactly how much, but I think you could at least leave out people you find merely disruptive).