See, now those are fine tragic backgrounds for characters! They were interesting and dramatic, without having to rely on [twin slasher] or torture, or both.
Back in the day, I've come across more than my fair share of RP characters that have [twin slasher] as part of their backstory. Some years back, this was actually taken to extremes when a member of the Mechanical Maniacs (Gauntlet may remember this) fabricated another user named "Zapper." Zapper was a young woman who was forcefully tattooed when she was an infant and raped by her father. Eventually, she was sent to foster care, but her father found her, kidnapped her, and repeatedly raped and tattooed her. At first, the story was vague, and early on was somewhat plausible.
It fell apart immediately when Zapper was discharged from a psych ward after eight hours.
If you are committed to a psychiatric ward, you are to stay there for a mandatory 72 hours. If you're a minor, you can get out after 24 hours, but only with express permission of the attending physician, after you have been assessed for risk of self-harm, and your parents have signed a consent form to allow you to leave against medical advice. In short, once you're committed, it's hard to get out before those seventy-two hours are up.
No one caught onto this right away, but I did and I started asking questions which poked more holes into the story. Eventually, it culminated into that aforementioned kidnapping, which ended with another psychiatric stay (again, not the mandatory 72 hours, or even 24 hours), and soon after, the user confessed to making it all up. He strung an entire forum along with this sob story about a girl who never existed.
Yes, this fabrication was stupid and pointless, but it's another example of a preoccupation with [twin slasher]. Why do people feel the need to include [twin slasher] in their character backstories? And to include it in such copious amounts? If [twin slasher] were a sandwich spread, some people would be trying to slather the entire jar's worth onto their bread!
This seems to be more prevalent with the younger crowd, namely the late-teens/early-twenties crowd. That's where I've seen it most often, used to the point where it was almost romanticized. Why would anyone think that such a heinous act is "good" for the development of their character?