Willowspirit
Crowing
We live rurally - and an outdoor cat is a dead cat - the coyotes get a lot of them. Our vet is part of a TNR (trap, neuter, release) program that adopts feral cats to keep barns free of vermin. As they are already feral before trapping, releasing them is a neutral impact on the environment, except that they can't reproduce. Vet recommends not feeding them, so they'll kill vermin in the barn. If they do head out to catch other prey - they tend to disappear.
There is a program like that near us and many others around the country if anyone is interested in barn cats specifically. We can’t decide. I’d rather get a pair of rat terriers for the barn but I simply can’t have more dogs!
Inside the home, where it is safe and warm, curled up around his favorite human. Indoor cats are awesome, and I've absolutely had indoor cats and will get them again in the future. 
(though ferals in these parts leave my birds alone) If you're concerned, I'd try to secure your coop as thoroughly as possible.
It's common practice on this road to keep a few for rodent control, since populations abound due to agricultural fields. As dutiful as they proved themselves to be, it didn't stop there. Everything from frogs to wild birds met a painful end. So much carnage. When one of my cats killed a nesting House Wren, leaving its mate confused and devastated, a doting indoor home was arranged. Bird lover that I am, this was the straw that broke the camel's back. Never again. From now on, any and all cats will remain inside. 
