That sounds like someone who never lets their kids play outside. There is risk in everything. Maybe your cat gets fucking diabetes from sitting around the house. Maybe let the cat do what is in its DNA which is to run, hunt, and experience life. I kept my Bengal inside for 2 years, but after having it escape a dozen times whenever the door was open for more than 2 seconds I finally let it outside. That cat spent 4 days at the top of a tree through rainstorms before I had to cut the tree down (with her at the top) because the noise was bothering the neighbors. And after a day of sleeping hard the cat was fine. Just like some children, some cats are not able to handle being outside alone, but most cats will do fine wandering around the yard. Sometimes cats do get in a zone and run across a road or something, but how is that any different than humans getting distracted while driving and getting in an accident? Risk in everything, better to take some risks and live life than sit indoors all day.