Please read all the way to the end before commenting why Jaina is X.
The Purge of Dalaran was, in a way, a proto-BfA in terms of how it was written.
There was potential for it, and some interesting parts, but ultimately it’s a self-contradictory narrative.
In dev tweets I’ve long lost track of, you can find out just how much was cut from the Purge’s story.
Aethas’ actions were wrong, but it’s understandable that he was essentially forced into a bad situation against his will and tried to make the best of it on short notice.
Jaina’s reaction was too strong, but not because “she went crazy”: She was reacting to something that was cut.
In game (for Horde), the taking of the bell is a stealth operation where you are forced/encouraged not to engage with/kill any guards/civilians. The bell is successfully taken without anyone being hurt.
In cut content, the taking of the bell sets off a catastrophe in Darnassus, harming and possibly killing civilians.
Jaina’s reaction to the latter is, frankly, more than understandable. But that isn’t what happened in game for some reason.
Back to Aethas. In case you were wondering, he had no idea about the operation until right after it had happened, and then he was told to keep his silence or Hellscream would bring ruin to Silvermoon. So he told Jaina nothing when confronted less than a day later.
The weird part is, none of these things happened in-game, but the story would make way more sense if they did.
Also, in-game, Jaina illegally keeps a garrison of Stormwind soldiers in Dalaran, but only in the Horde version of events.
I call this proto-BfA because while stories like the Southern Barrens, Dustwallow Marsh, or Broken Shore tell us two halves of the same story, the Purge of Dalaran and many events in BfA don’t tell the same story at all. And I think they were designed this way on purpose. Information is contradictory or omitted in order to incite arguments to which there is no correct answer because people are arguing over different events, not the same event from a different point of view. And I think the writers genuinely view/viewed this as a good thing.
Anyway. That’s a lot of why I don’t find WoW storytelling as rewarding as I once did. I want to play both sides to see two halves, not two completely different stories. I stopped playing Alliance in BfA not because of faction pride (ha), but because I didn’t want to keep two different narratives straight.