I agree, Selene loves eating peoplefor fun. That is the goal, hedonism, pleasure for the sake of pleasure for her own sake. She's lonely and no longer cares about how that affects her. She accepts the worst parts of herself and wants those aspects to thrive. I don't feel like her characterization has been all over the place at all. She craves power and wants to be at the top of any society making the rules. Helping x Corp was a stepping stone for her. He nature is to torture, abuse and harm. She's consistently done that for decades. Shaw has always been this selfish.