In addition to the activity stream thing, I think there are a few other fixes, although it may be a little late at this point.
1) No more definitive threads in the politics and religion categories. THE believer, THE unbeliever, THE marriage equality, THE today in church, etc threads just serve to perpetuate discord. All these threads need to have either some intrinsic expiration date or an external expiration date imposed.
2) No external links in the religion and politics threads. If a user reads a compelling article, and can summarize salient points in his/her own words in the length of a post that stands on its own, fine. But repeatedly linking to articles from external feeds is just spamming the board.