That's an... interesting way of putting it, where by "interesting" I mean "wrong".
If you genuinely can't see how similar considerations apply to you personally publishing rape-world stories and the reasoning you explicitly gave in the post then I suggest you have a real weakness in evaluating the consequences of your own actions on perception.
I could go off on how the idea is that there's particular modern-day people who actually exist and that you're threatening to harm, and how a future society where different things feel harmful is not that, but you know, screw it.
I approve of your Three Worlds Collide story (in fact, I love it). I also approve of your censorship proposal/plan. I also believe there is no need to self censor that story (particularly at the position you were when you published it). That said:
This kind of display of evident obliviousness and arrogant dismissal rather than engagement or---preferably---even just outright ignoring it may well do more to make Lesswrong look bad than half a dozen half baked speculative posts by CronoDAS. There are times to say "but you know, screw it" and "where by interesting I mean wrong" but those times don't include when concern is raised about your legalised-rape-and-it's-great story in the context of your own "censor hypothetical violence 'cause it sounds bad" post.
New proposed censorship policy:
Any post or comment which advocates or 'asks about' violence against sufficiently identifiable real people or groups (as opposed to aliens or hypothetical people on trolley tracks) may be deleted, along with replies that also contain the info necessary to visualize violence against real people.
Reason: Talking about such violence makes that violence more probable, and makes LW look bad; and numerous message boards across the Earth censor discussion of various subtypes of proposed criminal activity without anything bad happening to them.
More generally: Posts or comments advocating or 'asking about' violation of laws that are actually enforced against middle-class people (e.g., kidnapping, not anti-marijuana laws) may at the admins' option be censored on the grounds that it makes LW look bad and that anyone talking about a proposed crime on the Internet fails forever as a criminal (i.e., even if a proposed conspiratorial crime were in fact good, there would still be net negative expected utility from talking about it on the Internet; if it's a bad idea, promoting it conceptually by discussing it is also a bad idea; therefore and in full generality this is a low-value form of discussion).
This is not a poll, but I am asking in advance if anyone has non-obvious consequences they want to point out or policy considerations they would like to raise. In other words, the form of this discussion is not 'Do you like this?' - you probably have a different cost function from people who are held responsible for how LW looks as a whole - but rather, 'Are there any predictable consequences we didn't think of that you would like to point out, and possibly bet on with us if there's a good way to settle the bet?'
Yes, a post of this type was just recently made. I will not link to it, since this censorship policy implies that it will shortly be deleted, and reproducing the info necessary to say who was hypothetically targeted and why would be against the policy.