"Don't worry, sister." When Meng Qibao saw Meng Suisui staring at Meng Anzhi's back, he walked over to where she was standing and patted her on the shoulder. "Anzhi didn't kill the zombie, which proves that she is lying."
Not wanting to kill a zombie proved that Meng Anzhi wasn't that hungry. If she was really starving, could she have the energy to pick and choose? If she were in a desperate situation, then she would be the first to kill those zombies. Only with a full stomach would Meng Anzhi still care about the laws and rules of the civilised society.
An empty stomach was one of the worst kinds of pain a person could suffer from, and if that pain turned into starvation, humans would be willing to eat even corpses. How could anyone refrain from killing zombies? Compared to eating the rotting flesh of their own kind, killing a zombie was better.