Ok, now we are talking! My original post (which I didn't know MarvelMaster616 would make a thread of) was about showing the difference between what the editors "believed" the conclusion should be. Or what the "readers" would feel about what happened in opposition to what the law would says on the subject.
That's not the motivation that is stated in the comic by the narator (and several times): the first motivation was that she needed energy after the hyperspace jump. Sure, she enjoyed it but that's not why she first did it.
And it's just plain untrue that she didn't felt anything about those she killed: Dark Phoenix didn't know she killed them. As soon as Phoenix (or Jean if you prefer) learned what she did as Dark Phoenix, she was horrified. And that's why she feel guilty: If she didn't feel anything for those people, she wouldn't feel guilty.
And sure, the Jean who was in the cocoon still feel in part responsible because Phoenix was based on her. Because Phoenix came for her. And because of who she is. But also, as stated sevearl time, with or without her, the Phoenix would have come and would have found someone (last time it was stated was in the ToJG I think).