I couldn't put my finger on it for the longest time, but what I eventually realized was that I didn't like how inauthentic the whole thing felt. Changing a deeply held belief just isn't that easy, yet almost every thread has the OP giving a delta.
How it appears to me is that people have beliefs that they realize are either unpopular or controversial, and so they use the subreddit to learn what they "should" believe or at least a rationalization for ignoring their true beliefs.