> homogeneity of thought, with little options for those who go against the grain, either in general or on one particular issue.

Doesn't this differ drastically from subreddit to subreddit? It's really hard to talk about Reddit as this one place with one line of thought when it is really made up of disparate groups each with their own moderation style.

What are these "against the grain" opinions that you can't find a subreddit for?