Haven’t seen the show, so I probably really shouldn’t be commenting on it. Though that never seems to stop anybody.
The relevant point is that one doesn’t have the option of taking in that poor, pitiful, hungry, dirty feral child and caring for her.
She’s hungry all right, and it’s for your brains.
You’re absolutely right. Even if they’re not technically dead, they’re not really human. And even if they were human, they’re trying to eat your flesh. So it shouldn’t be desensitizing viewers to mass murder. Until such time as magically undead monsters start roaming the streets it won’t have any practical effects.