If there’s a setting where cats can survive and kill “wildlife”, I would push back against the use of the term “wildlife”, because in order for this to be true humans have eliminated most predator species in the “biome”. All I hear when people in a city say they don’t want feral cats is they want cute birds at their feeders.
In an area rural enough to have coyotes…feral cats can be a positive addition to the biome so you don’t get overrun by rodents. Birds don’t have to worry because the cats need to stay close to cover due to various predators.