Why not? You are pretty much the same, except from your body, skin and diet. Survival is the most basic instinct, I think they kept it as undead. I dare to say dying and being raised as undead even improves it as you gain more confidence about the meaning of life and people you cared about.
In Darkshore quests you can see that Sira was pretty mad at Elune and is negleted by Tyrande.
The moment you step foot at the beach she says:
Sira: Elune… was she watching over us as Teldrassil burned?
If you are questing as Horde, at the moment of her demise she kept asking why anyone didn’t come for help, why Elune didn’t do anything for her.
Questing as alliance you can feel the apathy of Tyrande when she and Maiev are flying and Maiev is concerned about Sira’s safety, followed by Tyrande’s response that was like “pft, whatever bruh”.