Of course stories that sexualize idols, especially minors is wrong and writers who do this are a disgrace to the genre. However, fan fiction is a legitimate writing genre and it is vital method of publicity for idols, bands, movies, TV shows, etc. Bands thrive on all types of publicity, whether it’s fan fiction or something else. I, myself would not have discovered VIXX if not for fan fiction. I like the name “Leo” and so I searched it on Asianfanfics.com and found an On and On era fan fiction. I then searched the song and have been a devoted Starlight ever since.
Ask yourself: Do fan fictions really dehumanize idols like you think they do? Do dramas dehumanize actors? Do music videos dehumanize singers? Do idols dehumanize themselves by cosplaying as various characters?
There are published books in shops about Doctor Who, comics and even an anime about Supernatural; that’s fan fiction. There is a chibi series about Infinite, there are spin off manga and short novels about Attack on Titan, which is also part of the fan fiction genre. If you watch the Korean drama ‘You’re Beautiful’ starring Park Shinhye, Jang Geunsuk, Yonghwa (CN BLUE) and Lee Honggi (FT ISLAND), there is a scene where the members of the band A.N.JELL find a yaoi fan fiction about them and act out part of it. There are comics about bands like The Beatles and The Monkeys and fanzines of TV shows and bands and idols.
Most popular TV shows and bands have books and comics written about them, there are stories with One Direction and other Western pop bands. It’s not limited to Korean Pop as you seem to think it is.
KPOP idols themselves are fictional characters to an extent. They change their names and alter their behavior for the camera, they put on different concepts and play out different scenarios for music videos. Writing fan fiction is no different from a director giving an idol a drama script where the character has the same name as the idol.
bronzebun, I hope this has cleared things up.