To me, policing articles for content is a terrible idea. Short of visually depicting something horrifically graphic or monitoring for something literally harmful (like malicious links or somesuch), there is no reason for us to stop people from writing about any given subject, even if it's something horrible like rape. We are a writing community, and if we limit ourselves to what we can and cannot even attempt to write about, we are doing a disservice to ourselves by "playing it safe".
What we do need to do is continue to stress is that if a user is going to try and tackle a subject like rape, they need to get HEAVY feedback before even thinking of posting it to the site (moreso than any other possible written work they attempt to post), and to make sure they understand the gravitas of what they're writing about. If they are writing about something as physically and psychologically traumatizing as rape, then they need to know that they're not just writing about some non-consensual sex and go from there. Rape is a very serious subject, and it needs to be handled delicately. If a character in a story is raping someone, then the author must acknowledge that what that character is doing is taking control from their victim and doing their best to destroy them. If this is ever presented without taking it genuinely and deadly seriously, then we need to make sure whoever wrote about it is aware of what they've written.
[EDIT: After reviewing what actually happened further and actually reading the tale, this part is irrelevant (particularly since you did get feedback, which was my primary concern).]
But as for the discussion question, no. I do not believe we should police articles, and it's precisely the reason I cited above that is my reason. When handled properly, taboo subjects can provide a massive amount of insight into a story, into the characters and into the events that are unfolding within said story. If we remove the possibility of using subjects like rape within our stories, then we remove any sort of worth proper use of those subjects can give us. I'm not saying advocate it, god no, and like I said, we need to do our best to make sure people aren't just going "lol rape" and being done with it, but we need to at least give our writers who want to handle the subject seriously the chance to do so.
I'm sorry for the very long post, I know a lot of it is stuff we're already aware of, and honestly it might just be a moot point anyway if this stuff has already been discussed in SSSC, but I just wanted to throw my 2 cents in.