Not only is roaming bad for the environment and local eco system, people near me let their cats roam. I live in a condo and see them roaming my area, But our building uses poison to keep mice at bay, and any mice near here are liable to be poisoned, which is dangerous for kitty. Also we see coyotes regularly in my area, which is super dangerous for kitty. I always try to tell the neighbors to keep their cats indoor for their safety