It's not just Arueshalae. And at this point folk would try to give me all these "logical" or "rational" explanations that could possibly be behind why these characters act as they do. But that's never the problem. To me the big problem here is, the game (as in, the writers), seems to try too hard to preach to the player grandiose life stories, profound life lessons, dramatic turns of events, deep philosophical ideas, while neglecting to make the characters real, believable, and relatable. I try to avoid using the word "edgy", but tbh a lot of the moments and the things that the characters say feel really edgy and cringeworthy to me.
Yeah, I'd not necessarily use "edgy" to describe the writing, but if out of six female companions the three romanceable ones also happen to be murderers, and two also cannibals (while the third apparently was a cannibal in the beta, except they've removed that)... I am not sure what the writers intended here.