Be Free!
This person totally doesn’t understand what collars are for. Since their childhood, this person has been taking off the collars of cats they come across on the street. Why? Because if your cat left your household, it must mean that it wants to be free, right?
What you’re supposed to do is look for tags to identify who the owner is. That way, the cat, which is probably used to receiving meals three times a day, doesn’t starve to death. And people let their cats out all the time! Releasing their collars won’t prevent them from knowing where they live, y’know.