Originally Posted by
Super Dickmann
Reposting for your consumption:
Mind control is consistently more effective than individual psychological manipulation, as can be seen given that virtually everyone with a name who Sylvanas raised turns on her, from the Rotbrains, to Godfrey and company, to Galen Trollbale and his followers, to Derek, Lilian and Zelling and to the Night Elves themselves, Sira aside. The asspain around this issue is vastly overblown.
The LK simply doesn't give them their brains back after that manipulatable state, but holds control of them. That's why the undead only turn on the LK when his control lapses, whereas Sylvanas is betrayed by practically everyone who she brings back.