My cat(s) are strictly indoor. I gew up with cats who went outside but even neutered, inevitably one of them was hurt in some way - chasing something, eating a piece of something that made them ill, scratched by a neighbourhood bully - cat or other creature. It's hard when others insist on allowing their kitties roam. Cats will be cats.
Here is a list of perils that may beset a cat outdoors.
Mine are strictly indoors - they have short hair or no hair so are interested in outside only when it is warm anyway. YY goes out in her stroller or on a leash. I also have a back yard that is enclosed for her but I never allow her out unless I can be there.