Ferel cats are predators - and they kill for fun. If they would only kill and eat what they needed to survive, maybe I wouldn't have such a hard time accepting them in the environment, but they don't. If people wouldn't let their cat run loose outside, there wouldn't be cats roaming around killing things. They are not part of the natural environment nor a natural part of the ecosystem. People who feed ferel cats are under the mistaken impression that they only kill for food and that by feeding the cats, the cats are then not killing anything.
FOR EXAMPLE: At one time I lived on the end of a dead end road, about 1 mile from any neighbors. It was an old farmhouse that I rented, but it had a large pole shed and an old abandoned barn that was quickly rotting away to nothingness. It sat on 160 acres of abandonded farmland that had returned to meadows.
There were two cats that hung about that I would see regularly. One was a ferel black/white and the other was a orange tabby from the neighbors place (remember 1 mile away). Anytime that I went and walked along the driveway, about every other day in early summer, I would find a minimum of 7 or 8 songbirds that were obvious cat kills (mice also). And that was what I found on the two track dirt road which ran only from the farmhouse to about 100 feet past the barn. I could look into the barn at any point in the early summer and find a birds nest torn down, shredded and the eggs/babies ripped apart. I actually sat down one day and watched the orange tabby climb into the rafters and do this. This was a very pretty, very friendly, well fed barn cat that traveled a mile to get to my place to hunt. Was he hunting for food - NO - he was having fun, because killing is what cats do.