I am totally against letting cats outside if they are loose. I used to let mine out but they were harnessed and on a 25 foot leash. I can't stand it when people let their cats loose outside. How is it any different than a dog? I would never let my dogs out loose either. It is just WAY too dangerous. A friend of mine has had 3 cats, a dog and a rabbit all hit by cars. I am not willing to take that chance with my babies.
Also, I don't want any of my animals going and pooping on anyone elses property. Some people don't have animals because they don't like the mess so why would they want the mess from my cat?
Sorry, but it's just my opinion.