Originally Posted by
Kiri
While there might be some merit to this explanation, I don't think it holds up completely due to the rigidity of the change itself. For this specific example? Maybe, though it is still weird that she would follow the one that 'damned' her forcefully into undeath. Mind you, Arthas killed her but did not raise her. It was Sylvanas who came for her years after death and raised her, by her own words, using the Val'kyr ostensibly. It does not really jive that someone would become a fanatic loyalist after that, eager enough to rush into alternate Draenor just to please the Dark Lady, without some form of mind control being utilized.
Or rather, let's call it a compulsion more than what is commonly seen as 'mind control'. The people raised by Sylvanas are not mindless extensions of her, after all. They are able to move and think on their own. However, they also seem to be compelled to serve her in an unnatural way, one that cannot be explained away by 'the rest of the world would not accept them'.
Let's look at some examples here.
The inhabitants of Fenris Isle. They are ressurected and immediately join the Forsaken. No thought, no conversation, they just pick up arms and attack their friends and families.
The Kaldorei raised by the OP's reference. Again, people joining their murderers to fight their former friends.
The Desolate Council from the book. Now, there are some peculiar things about these guys. First, they are 'first generation' Forsaken, i.e. those originally raised by Arthas. They are among the oldest ones there are as a result of this, and they are not directly raised by Sylvanas or her Valkyr. Now, the following is obviously spoilers for the book, so the warning is up. Anyway, the desolate council, as a whole, is loyal to Sylvanas. They did not start some coup, but are just citizens that stepped up to take over administrative duties while she was gone. However, some of them tried to escape, in order to join the living.
The Royal Apothecary Association. Or rather, the ones involved in the coup. Those guys actively defied Sylvanas, tried to kill her, etc. Notably, the coup happened in Wrath, before Sylvanas acquired the Valkyr and subsequently that means they are all first generation Forsaken.
Going by this - admittedly small - sample, I would propose a bit of a theory here. Forsaken are not all the same. There might be two distinct generations of Forsaken, distinguished by who raised them.
The first generation was raised by Arthas. They, at first, were under his complete control. While it might have appeared that they were but mindless minions in Warcraft 3, some retained their personality while still being bound in his service, just like Syl herself. There are likely sub classes there. What is important though is that when Arthas' powers waned, the compulsion was lifted from them. They became the first Forsaken and were able to carve out their own path. This is the part of her people that Sylvanas has to actively rule and appease, the people whom she actually, to an extent, seems to fear - because they are able to betray her. They don't seem to be bound by the same compulsion, albeit maybe by a lesser version of it, possibly due to innate banshee abilities. They seem to have a personality close to their old, if the interactions in BtS are any indication.
The second generation though, those are the ones raised after Wrath, by Syl, through the Valkyr. Those appear to be bound to her will immediately after being raised, much like those raised by Arthas were initially. So far, we have not really seen any of those rebel against Syl in any capacity, and often pull a complete one-eighty personality and allegiance wise within moments. Potentially, they might revert back more to their older selves, if Sylvanas' power on them was limited again.
Well, it is an hypothesis at least, but it would explain why some Forsaken seem to be more loyal to Syl than others, or why some are more antagonistic to the living than others.