We have a similar problem on the family farm.
It being a farm, and sufficiently rural, it has a colony of feral cats. The cats just sort of seem to congregate and colonize, over the years their population seemed relatively stable. There was always about two dozen cats on the property. I assumed that the predators in the area and the highway were keeping the population down despite my Aunt and Uncle not having the resources to trap and neuter the cats.
The cats have several indoor places to live during winter including the barn and a few outbuildings and they are fed by my grandparents who also live on the property, though it is a supplemental feeding so they still keep the varmint population down. There has always been a wide variety of song birds and chipmunks and such around, so it didn’t seem to be a problem with cats preying on the wildlife, nor did I ever find a single cat doot in my grandmothers ENORMOUS garden.
However, what I didn’t realize, is that the reason that the population is so stable, staying at about two dozen cats, is that in the years where natural predation by coyotes and hawks didn’t keep down the population my uncle was ahem shooting them…
I was startled to learn this, as my uncle is an animal lover, hell three barn cats have suckered their way into being house cats ,and they have always spared no expense in caring for their pet animals. However, I guess I cannot fault his reasoning, nor really his method. If there are too many cats they start preying on the wildlife, and disease ran rampant a few years, leaving dead and dying cats occasionally found by his wife or his daughter. Trapping and taking the cats to the pound puts strain on the humane society’s resources in a small rural area for cats that WILL be put down due to their temperament. Poisoning them seemed cruel and uncontrollable to him so when the population boomed, over the succession of a few days where he was alone on the farm he would take his scope and his rifle and …cull the herd… as it were.
(woah it feels squidgy even relating it)
I know he is a crack shot, and he assures me that he only takes shots that are certain kills. He also disposes of the corpses promptly. I know there is not a TNR vet or program in the area, and I know that they certainly don’t have the money to neuter a half dozen cats every time there is a population bloom. Now, this isn’t really an option for the OP of course, but I can’t really fault my uncle for his decision.