No, cats can come to harm and they can harm local wildlife
by Elle Suzzane
(New York, NY)
Man has done a lot of damage to the ecosystem and that includes introducing domesticated animals like cats and dogs that will attack local wildlife. Even well fed cats can attack local birds and small small mammals. I remember my childhood cat leaving us "gifts."
As for the cats themselves, depending on your location they can get hit by cars, abused by not so nice people and even get attacked by predators bigger then them. They have been domesticated for thousands of years and no longer belong in the wild.