I think a lot of people forget what Revendreth is about.
Revendreth isn’t a place of atonement for some cosmic level karma or anything. There is no greater right or wrong. Revendreth was the place souls in desperate need of reform went, before being assigned their proper afterlife.
In other words, it wasn’t the individual’s actions that were the reason they wound up in Revendreth, but the underlying psychology and personality defects that landed them there.
In the long run, Zul’jin sacrificing the Loa of the Amani was nothing more than a weekend spa treatment in Ardenweald for them. No, what that little stunt was evidence of was a self-destructive obsession with revenge against a people whom were largely content to ignore him and his. Now, how is Zul’jin supposed to be any kind of decent soldier in Maldraxxus, if he’d sooner kill the Primus and feed his power to his choice lieutenants, rather than obey orders and fight for the glory and honor of Maldraxxus, and the defense of the Shadowlands?
Revendreth is where souls went to be corrected of their innate faults. Greed, Ambition, Hatred, Jealousy, etc… these are all characteristics that have their uses and place in any afterlife in the Shadowlands, but when these characteristics are so out of balance in an individual they make them essentially non-functional, that’s when Revendreth comes into play.
And if they can’t get over themselves? The Maw awaits.
TL;DR - You don’t go to Revendreth because you were a drunk driver, you go to Revendreth because you had a drinking problem.