Lets look at what is known, then draw some conclusions.
1- Her #1 motivation up until the end of Wrath was revenge on the lich king. After his death, and her following suicide she went to “hell” and 9 Scourge Valkyre were very motivated for themselves, and Sylvanas to not be stuck there and made a bargain to get them out with Sylvanas’ end of the bargain unknown
2- Another death in Silverpine cost 3 more Scourge Valkyre to raise her in MoP.
3- Legion happened, she’s promoted to Warchief, we see her for a bit making another bargain with Helya while Sylvanas’ end of the bargain is unkown, then again in Stormheim trying to enslave Eyir only to be stopped by Greymane. Helya is dead, and Syvlanas may no longer bound by that contract.
4- The 3 sisters webcomic was released, Sylvanas is genuinely pissed at her sister for willingly siding with the void. Alleria’s void voice in her head is sofa king scared of Sylvanas it urges her to murder her on the spot.
5- BfA launch. Sylvanas master plan is a bloody nose tactic, up until burning the world tree it made strategic sense, burning the tree was a significant turning point for the character, if not out of character but can be explained later below
6- The recent “she ordered wrathgate” revelation was very surprising to the point that it doesn’t add up, and here’s why…
It makes very little sense for Sylvanas to have ordered the wrathgate with the current timeline. It was a staged coup by Varimathras. She was not bound by any known contracts. It seems very unlikely a whole plot arc would be devoted to that only to do Battle for Undercity immediately after. It seems like a high risk plan of kicking out Varimathras(which did need to be done), where as she could have just asked the horde to do it for free anytime since day 1 up until that point. Dreadlords can not really die, are full of cunning, deceit, and they may be pulling some strings somewhere.
The thing at the top of the list in the Void afraid of Sylvanas would be Balnazaar, and or Varimathras. Whatever it is or isn’t clearly wants Sylvanas dead, which draws another conclusion. She is clearly not working on behalf of the Light which may have been part of the bargain struck by the Valkrye at the end of Wrath in point #1 above. The more this point goes on, the less sense it makes
Part of that bargain could be(get me souls, but wait 3 expansions) burn the world tree because contract or its back to hell which can kinda sorta explain point #5, its a feeble explanation at that.
If she really is off the rails crazy, then its inconsistent with the rest of her character history within the current timeline
Grab a tinfoil hat for this one below
Or this is some really effed up social experiment to make us realize that just because we get attached to characters does not mean they are making anything great again and need to be removed from power immediately before they stray further from their founding core values. We need to come to terms with this right quick before its over.
I really don’t think they would involve tinfoil hat stuff into this game with such a divided audience, but the dividing the people similarities are there, minus the tree burning.
Thoughts?