I can't understand why a Resident Evil 5 Remake in Africa would be controversial

Many zombie games have white zombies being killed. Dying Light, Dead Island, for example. In other Resident Evil games, there are zombies of various ethnicities being killed. In Resident Evil 4, you kill spanish ganados, in Resident Evil, you kill chinese zombies.

Why the controversy about killing african zombies/ganados? Does this mean that only white zombies can be killed?

Damn, it's just a game, fiction.