I agree that it's better for that post to not be on LW, but banning such things is not standard procedure, and people don't like it when moderators do surprising things. In particular, the post didn't have more serious pathologies sometimes present in other posts (that are usually still not banned), such as hosting a bad prolific discussion or getting downvoted to minus 20.
(If I were to ban posts on the grounds that I consider them bad for LW, I would ban maybe a quarter of Discussion posts. I don't have authority to do that, and don't expect good consequences unless the procedure is accepted by the community on some level. This doesn't seem likely or even desirable in the sense that there are better alternative procedures such as weighted votes, which would have less blind spots.)
I'd be interested to see what would happen if that quarter of banned posts went into a Trash section. Would it be boring stuff barely distinguishable from Markoff chains? Probably so, by my standards. Would it end up generating some weird and lively stuff? Probably also true, but I'd be letting other people curate the Trash section.
Or possibly, considering how bad it might get, LW-Trash could be on reddit.
My stupid fanfic chapter was banned without explanation so I reposted it; somehow it was at +7 when it was deleted and I think silently deleting upvoted posts is a disservice to LessWrong. I requested that a justification be given in the comments if it were to be deleted again, so LessWrong readers could consider whether or not that justification is aligned with what they want from LessWrong. Also I would like to make clear that this fanfic is primarily a medium for explaining some ideas that people on LessWrong often ask me about; that it is also a lighthearted critique of Yudkowskyanism is secondary, and if need be I will change the premise so that the medium doesn't drown out the message. But really, I wouldn't think a lighthearted parody of a lighthearted parody would cause such offense.
The original post has been unbanned and can be found here, so I've edited this post to just be about the banning.