Okay. Maybe I have partially misunderstood then. It is the whole soul-eating mind-controlling seductress part. It is an extremely evil concept, no matter how writers may try to frame it.
I have also been triggered by how Marvel have handled several of its characters that have committed irredeemably evil acts.
Just a few examples:
The White Queen is a smug and haughty supremacist systematic torturer and serial-mind rapist, but is still treated as a hero now.
Mystique is an extremely gleefully sadistic, thrill-killing mass-murdering, treacherous, lying, manipulative, duplicitious, and hypocritical psychopathic genocidal supremacist and rapist, who also threw her own baby down a waterfall to save her own skin. She is somehow treated as a leader of the mutant community now, and many attempts have been made over the years to justify her actions or make her sympathetic.
Apocalypse is an example of somebody who didn't think that Adolf Hitler went nearly far enough in his views and actions. Marvel has somehow still decided that it was a good idea to try to portray him in a sympathetic light recently.
Mister Sinister is a character built on the premise of "Doctor Mengele didn't go nearly far enough" instead, and he is now treated as a perfectly acceptable leader of the X-Men without anybody raising an eyebrow.
Thanos is a casually omnicidal thrill-killing psychopathic nihilist and necrophile, but he has still starred in his own stories where he was treated as an anti-hero.
And the basic concept of the X-Men has basically turned into: "We are a a bunch of superhumans/over-people who are somehow oppressed by all of the regular powerless/"worthless" poor people, even though many of us regularly commit unfathomably cruel and sadistic acts of murder or violation against them, and we never take them to task for it. Please feel sorry for us. We cannot help that we are all so much better than the rest of you."
So yeah, Marvel Comics' moral center has seemingly gone straight to hell, as far as I can tell.