A fictionalized person in a 2-hour film or TV series, unless it's a documentary, is not the same as that real person. If I write Abraham Lincoln Vampire Hunter fan fiction, I'm not writing about actual Abe Lincoln, but the character in the novel or movie. It's a limited canon.
If I write about John Wayne Gacy in the context of that stupid serial killer dinner on AHS: Hotel (that prompted be stop watching that show), it's in the context of that show about that fictionalized version of him. Writing Ed Kemper and Holden in Mindhunter is the fictionalized character of Ed Kemper in the context of that show. It may be a subtle difference, but it is one.
Fictional canons about real people aren't the same, no. And again, no, NAZI or Serial Killer RPF in a damn holiday fan fiction exchange is not the same as fictionalization of real people in books in movies. That's absurd.
Re: ars_belli
If I write about John Wayne Gacy in the context of that stupid serial killer dinner on AHS: Hotel (that prompted be stop watching that show), it's in the context of that show about that fictionalized version of him. Writing Ed Kemper and Holden in Mindhunter is the fictionalized character of Ed Kemper in the context of that show. It may be a subtle difference, but it is one.
Fictional canons about real people aren't the same, no. And again, no, NAZI or Serial Killer RPF in a damn holiday fan fiction exchange is not the same as fictionalization of real people in books in movies. That's absurd.