Krakoa feels like it really shoulda had a cop-out at the end of it like "Shadow King exacerbated the darkness in them".
I'm almost certain there was something like that intended at first, though not in terms of a villain mind-controlling people, but rather Krakoa itself having a general coercive psychological effect on mutants.
One of the first things Moira says in HOXPOX when talking about her power is that the womb has a sort of "baked-in bliss, zen via biology"
Being in Krakoa would, by itself, nudge mutants towards complying with this new status quo, softening to them the moral transgressions they were collectively engaging in, which could be out of character for some.
Early on, some like Logan and Laura would express that things felt wrong, and that the island was lulling mutants into a false sense of security, making them soft.
Later, a plot point is that resurrection itself is causing mutants to disregard the value of life, and eroding their morality (which is exploited by Orchis by introducing a collective psychic parasite version of Onslaught).
Considering Moira's plan was ultimately to depower the mutants,
maybe the original plotline included her engineering a situation where mutants got softer in their success by replicating the womb/mother/home's sense of safety, and eventually use that to slip them the depowering cure.
But then, none of was in the outline of Hickman's original plans that's been going around (I don't have them at hand but it was something about the Council falling to in-fighting, Mystique making good on her promise to burn everything down, Storm and T'Challa having a son that grows up in The World, etc), so my theorywank may be all wrong.
I just wish they'd explored the ideas of "we should fight for the common good" versus the sentiment of "fuck them all, they didn't help us when we needed it" from the active X-Men.
Bro the X-Men team was
explicitly the "let's go help people" team, independently from the Krakoan authorities.
