Even that consideration could be suspended if there was something particularly fascinating about him beyond that, but I think the type of depravity he was engaged in was already employed as a muse of sorts in less obnoxious ways by various Frenchmen in the 1700s-1800s.
Or even earlier like François Villon in the 15th Century, a murderer, highwayman, and a top-notch poet. It wasn't until the 20th Century with Jean Genet that we saw an outright criminal be such a good French writer. I suppose Antonin Artaud came close, but both Villon and Genet were, at least at points in their lives, career criminals. Artaud was simply insane.
Super fun sci-fi space opera but with rape and human trafficking. I highly recommend.
Anyone have any opinion on Donaldson's Thomas Covenant stuff? It was also super-edgy (and amazingly involved rape as a central event in the series) but one thing I liked about it was Donaldson had a plotting method where he'd start the writing process from the conclusion and work backwards before starting actually writing, so he'd know what the plot was.
Plotting was definitely his strong point. The books were definitely fucked up, though, at least from a position of pure edgelordery. They weren't Samuel R. Delany's Hogg level of fucked up, but they were plenty fucked up. The protagonist was literally a leper (irl) who raped someone because when he ended up starring in the worst isekai ever, he just decided to rape someone because he didn't believe he was in reality but just dreaming, and then the consequences piled up from there.
In my experience, I see that in all literary scenes now. Just came back from a reading a little while ago where a dude is doing his reading of a novel in progress and he blurts out "I stare at dog assholes." Which isn't writing at all, that's just Tourette's.
Have you read Motherless Brooklyn by Jonathan Lethem? I wouldn't actually consider it fucked up, but it involves a detective with Tourette's trying to solve a murder (of his mentor). It's generally fairly dark but has some hilarious moments.
Of course maybe my sense of humor is weird because I had to put down Kafka's The Trial a couple times because I was busting a gut laughing.