

Secondly, not feeding the cats won't cause them to simply go away. They will look for food sources and safe places to nest, and set about the business of starting a colony. A single un-neutered female cat can multiply very quickly and it would not be beyond the bounds of possibility for there to be 20 cats a year or so later.
The best approach is to work with local rescue centres, to try and neuter the cats. If there are too many for the rescue centre to handle, maybe you could assist by allowing several of the older cats to return once they've been neutered. Given a safe place to eat and a regular supply of food, they will provide an effective and safe rodent control. If you are the manager or owner of a location or site which has a fledgling colony, encourage your employees to start a food rota, the cats can be fed daily in a safe place and it is unlikely they will be seen much around your premises during the day. They will come out at night and earn their keep by ratting etc. Most charities will take any kittens as they are easier to tame, and there may even be some tame adult strays in the colony who can be rehomed. If you act quickly, there shouldn't be too many feral cats who are unable to be tamed.
The worst thing you can do is to "let nature take its course". Apart from the suffering that the injured and sick cats will endure, they will breed and nature taking its course will result in many many more unwanted cats.
Such locations, including farms and factories inevitably end up 'supplying' small kittens to employees or nearby houses and distant relatives - many of whom take on the kitten without considering the long term. By doing this they add to the cat population. This means we struggle to find homes for our cats and thus cannot admit needy animals. Sadly many of the kittens 'handed out' to the community are never blood tested nor neutered. That spreads, further afield, diseases and breeding cats. At the end of the chain somewhere another litter is denied admission by hard-pressed rescues or put to sleep, drowned or dumped. Last year, the charity who took Gus, a small local charity, neutered over 1200 cats, many located a long way from their "patch". And still the excess of unwanted cats continues.
As for Gus, he is on the path to a happier future. His wound will take some time to heal, but whilst his physical wounds are recovering, his carers will begin work on his psychological wounds. They will start the long process of teaching him that humans can be trusted. That he can learn to live alongside people, relying on them for food and warmth, and maybe one day he will be confident enough to be rehomed as a domestic pet. If not, we believe our friends will try and find a home for him on a stables or farm, or maybe return him to the original site. Had they let nature take its course, he would by now be dead or dying, alone, unloved and unwanted.
Is this really what Mother Nature intended for her purry furry little guests?