I wouldn't say someone who let their cat out is a waste of oxygen but I do think it's just as much a gamble and can end in trouble as much as letting a dog roam. My dogs would not run away but they very well may be hit by a car, poop or dig in other's yards, and so on. Cats do the same. I've seen so many kitties hit by cars and have come too close myself. I hope and pray I never hit one. I saw a big fat orangie cat wearing a collar, obviously someone's pet) hit right in front of me once. The car kept going but I pulled over. It was too late, he was gone. I felt so sick at heart and moved him out of the road.

I've been in neighborhoods where many let their cats out to roam or even kept them outside full time. Often they'd be in my yard using the garden for their toilet, get up under my car to make me afraid to start it, sometimes even fighting near my bedroom window in the middle of the night. I know someone who always kept her dogs in their fenced yard or in the house, but once they were out when the neighbor's cat hopped over their fence and the dogs, seeing this as a toy, grabbed and killed it. Then you have stories like this where some sick and demented person got ahold of the cat.

Just some things to think of, when people seem to get really frustrated with those who let their pets, cat or dog, roam around unsupervised.