Just had a thought. We all kind of realize Shane & Carol are of the same philosophy. Cut loose your humanity in order to do the terrible things. The interesting thing is that Shane tried to force that way of life, violently, emotionally. Carol just accepts it as easily as a husband who beats
her. In THAT way, she hasn't
changed. She's just gotten stronger & more independent. The Zombie post-apocalypse is her new abusive relationship & she's resigned herself to it.