They are too murderer's. Anez killed a man. It may have been accidental, but (a) that's still a crime and (b) it means they're dangerous. If Carl hadn't showed up, Anez would have killed those hit men as well.
Playing the irresponsible princess angle is fine. Having Anez's gun go off, shooting over the crowd and scaring everyone, is fine. But when they kill someone, even by accident, and the hero of the book is all right with it and goes to buy furniture...nng.
You do realize Carl is the hero of the story, right? Power Girl didn't catch the party girls; Carl led her to them, Carl helped talk Anez down from de-aging Power Girl, and it was Carl who is keeping an eye on the girls in Rio. A jet pack with Wikipedia access could do what Power Girl did in the last two issues.