I'm afraid to ask that I desire context to your statement.
Junko Furuta was a high school girl who was kidnapped in November 1988, then raped and tortured over the course of 40 days, before being beaten/burned to death and her body disposed of in a drum filled with concrete. Her case is infamous, not just for its brutality, but because the men who committed all of it were teenage high-school dropouts.
Because the Approver thought the art quality was good enough. The image is undoubtedly in bad taste if you know the context, but that's irrelevant to whether or not a post gets approved. And most Approvers probably wouldn't recognize the reference anyway.
Junko was a minor when she was murded and is what this is depicting. Real life minors are prohibited on Danbooru
A rather silly reason to flag this. A drawing of a real person isn't the same thing as a photo or video of a real person. The drawing isn't even depicting anything explicit either, just questionable subject matter because of who is depicted.
The image is undoubtedly in bad taste if you know the context, but that's irrelevant to whether or not a post gets approved. And most Approvers probably wouldn't recognize the reference anyway.
Late but fuck it, ironic enough, I knew who Furata Junko is and her gruesome case. Though I do share the same sentiment about what happen to her, but like you said, it's entirely irrelevant to Danbooru which I agree with.
To be fair, there are like 4 mangas and a pair of references in horror movies anthologies, the police was that incompent they could've saved her in week 2, but...