The question, as is, asks the question: Given that a horrible gang rape happened in a fraternity event, what can and should the university do?
This question is reasonably independent of the actual university in question. Furthermore, even if no such events had happened, the similar hypothetical question would have the same answers, and would still be on topic.
The question is not part of an argument, and is not intended to be evidence for anything, and as such editing it to point to actual examples, with maybe a note at the end about the original question, is in my opinion unproblematic.
The current situation, where the question claims that there a happened a rape at a particular fraternity where such an event did not happen, is very bad: it makes a serious false accusation. At we should edit in a note saying that that the claim about the rape is false.
In fact, I went ahead and edited the question to include a note about the retraction and similar events. A false accusation should not stand uncorrected.
Academia.SE is not an advocacy group
This section mostly addresses a misconception by the user Ben. Academia.se is not a discussion group or an advocacy group. It is a site for asking concrete questions about academic life, and for providing answers to such questions. This is not a blog or a discussion forum.
The reason why this particular question contained misinformation for such a long time is because nobody who knew about the misinformation happened to read it and bothered doing anything to address the matter. It was a good thing for Ben to let the users know about the issue.