All things bad
The True Detective finale got it right. The series was about the relationship between Cohle and Hart (coal and heart!) and the last episode resolved it. The extent of the serial killer's murders was too expansive to depict literally so the writer and director employed metaphor -- an image Lovecraft and Philip K Dick readers would catch immediately -- and in that moment the crime story transcended its genre. Which, in my humble opinion, makes great crime/noir stories great. Think Kiss Me Deadly when the suitcase exploded.
The ritual of the Yellow King was a portal to another universe of parallel evils courted by all the characters. Rust carved the figures of victim and spectators out of beer cans. Even Marty's daughter when she played dolls arranged them in the same voodoo circle: she was toying with an opening to all things bad. It was no accident that fornication led to both Marty and Rust's downfall: Rust took Maggie from behind and the final straw for Marty's marriage was fucking a prostitute up the ass. Everyone fell into an opening, and the opening changed their lives.
Sexuality is not gender, and some critics have commented that there should have been "more" female characters in True Detective. Which is true. Instead of a triangle between a female and two male leads it could have been between three women, or a group of four female friends. Perhaps there could have been some light comedy to it, too, and better product placement. But that would have made it a different show.