Exactly. This is why the Shal'dorei joined the Horde instead of the Alliance. Thalyssra sacrificed much and worked hard with us and her other allies and freed her people from their dependency on the Nigh Well to survive, even going so far is to let the Night Well shut down with the removal of the Eye of Aman'thul which was the thing stabilizing it to begin with.
And what did Tyrande do immediately in the aftermath? Lay into her and compare her to Elesande, who really only sided with the Legion because it was all her abilities to scry timelines could show her about the survival of her people. The entire population would have withered away when the Legion wrested the Nightwell from them. Doesn't excuse her behavior towards her people like banishing them to wither and die or brutalize them like Overseer Durant did to Margaux in the Vineyards, but she didn't join the Legion for personal power or anything. Tyrande also conveniently forgets that Thalyssra was one of the leaders of the original rebellion against Elesande after the bargain with the Legion was struck and nearly withered completely as a result of their defeat.
Then, of course, she has to drag up Azshara as well because she is still holding a grudge against Azshara and all the other High Elves for the War of the Ancients.
Meanwhile you have Lady Liadrin actually talking with Thalyssra this whole time, understanding what the Shal'dorei went through as she and the other High Elves went through the same thing when they were forced to destroy the Sunwell after Arthas corrupted it when he resurrected Kel'thuzad as a Lich. Like the Shal'dorei, they went through various, not-so-nice means to deal with the withdrawal.
So whereas Tyrande met Thalyssra with scorn, accusations, and ultimately rejection, Lady Liadrin and the other High Elves met them with empathy and compassion. Who is to say that these Forsaken Night Elves won't get the same treatment? No matter what mitigating circumstances may exist, there will always be some who will reject them for siding with Sylvanas even if only briefly.