Did you ever stop to think that perhaps the cat population is so out of control because humans stepped in? I don't think God is a flawed being that would create a species so prolific without purpose. I think it is an unfortunate truth that felines are just part of the food chain, just like wild rabbits. Both prolific animals who are a favorite of foxes. So, if it means that predators get my cats when my cats wander into the predator territory, or out of the safety of the barn rafters, then I can accept that as unfortunate as it may be. Besides, what is a more natural and "green" form of rodent control than a cat?