Originally Posted by
Super Dickmann
A ghoul or say, a skeleton made out of the body of a Horde soldier who died in some way, maybe if exposed to Blight, also lacks free will. Derek on the other hand has free will, he's just being tortured into compliance, which effectively makes him a slave. Raising a ghoul is if anything worse.
Rehgar was a slaver, who had a belf slave, so a member of the Horde, and was a top advisor to Thrall. Garry had the gladiatorial slaves you fight on the Durotar coast, we have slaves mining in Warfang and so on. As for Death Knights, Sylvanas has some in Warfang and some show up in the Ally version of Stormsong, so it's clearly still practiced. Derek was an Alliance member who's last standing membership was under Daelin "Kill all orcs" Proudmoore.
I don't know why people pretend this was a morally correct choice. Nothing confers Derek's life with superior value to those that Baine kills to free him and at least those guys were fighting the Alliance rather than being members of it. It's definitely not because he cares about free will or necromancy, since he's not spoken up about it any time it's happened on a larger scale before. And you know what else takes away people's free will? Killing them. When you're dead, you don't have any free will at all.