I feel like this look at Zombie fiction is incorrect. Given the shift of zombie from being enslaved to massive hoard is a commentary on corporate entities enslaving mass people. Nearly every piece of Romero inspired Zombie fiction the evil is usually a group of amoral assholes.

Romero's "ghouls" are an explicit commentary on corporate/consumerist enslavement. And just about every major Zombie fiction after the zombies are created by amoral corporate/government entities. It's very surface level reading of Zombie fiction to view is "the monster is other people"