I am not ignoring part of her characterization or misrepresenting it. Elune has a darkside to her a portrayed in the lore. You keep spinning it to be "good" all around. Actions born out of anger can be malevolent. Tyrande is not just acting as a warrior priestess out of self defense. But invoking a dark power that will consumer her to slaughter the horde out of vengeance.
That link contains spoilers for 9.1. It matches the recently data mined in-game cinematics for the quest. It references a second cinematic that shows Elune as not yet being implemented (or encrypted) https://ptr.wowhead.com/news/sister-...n-story-322125
Would a righteous, and good, power cause Tyrande to harm her son and allies? Would it try and kill her by absorbing more power? It also indicates that Elune is 99.9% a sister to the Winter Queen. .