[acdha]

You're leaving out a major argument for enforcing general community standards: does being part of a larger group make discovery enough easier to help recruit new members?

In the case of Reddit this argument is especially worth consideration given how common it is for people to promote bigotry with memes & other jokes or selective filtering (remember the guys who only post negative news stories featuring black criminals?). It's very plausible to believe that many users, especially younger ones, hit something like /r/news or /r/funny and end up on a hate subreddit without realizing how far off of the mainstream it is. That seems especially worth studying given the common anecdotal accounts from parents who found their kid managed to start out in a Nintendo forum an end up in pretty dark places.