Bianca doesn't do people. They're whiny and complicated and feel so intensely that it makes her head spin. And sure, there are some exceptions, but for the most part, in Bianca's opinion, people were crap. She tends to stay as far away from them as possible, and, up until just recently, it's been working out pretty well for her.
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Amanda is a 'psychopath' with a wanted dead or alive billboard to her name. Is she proud of it? Hell yeah, you bet she is. Does she think they'll ever catch her? Of course not, it was only mortal law enforcement pursuing her after all. If it was the Council she might've had a problem, but they didn't seem to care. As long as the mortals didn't get suspicious she'd be perfectly fine.