I believe they choose jobs to be completely neutral.

Take for example fire, you can burn yourself or your whole house. But fire is also used to cook and warm ourselves.
It's not evil or bad, the use of fire is. Same principle is used with jobs, Guns are dangerous but not evil or bad.
The same goes with magic or dark arts. That's why Reaper has been added instead of Necromancer, it was a moraly acceptable choice that would not display your character Alignement.

It basically means that all PLD and WHM are not obligatory good people. I mean, whole Shadowbringers what showing that.
If you mean jobs that focus on Dark Arts, Fell Knight could be added but it shares many similarities with Dark Knight.
Hell Knight is a job that simply screams "I am evil" in the same way as Reaper, so i doubt it will even reach XIV in this form. I won't mention Death Knight for the same reason.

Witch could be elaborated as its own job.
Golbez is a Dark Knight using magic, it could be an inspiration for a job.

That's as far as I can think for """evil job""".