I think that it is safe to assume that none of you are wildlife biologists or have background in any of the scientific disciplines that pertain to animal behavior. Well, let me spell this out to you: CATS DO NOT NEED TO HUNT. I know many responsible cat owners who do not allow their pets to roam freely killing things. Guess what, none of them have died from depression. Why? Because they DO NOT have to. Of course, I would be happy to read any scientific studies that you suggest would demonstrate otherwise. Also, you might look into local ordinances and fish and game regulations regarding pet owners who knowingly permit their animals to prey on certain species. You may get off on letting Tabby torture a rabbit, bird, or squirrel to death, but your "driven by genes" argument won't impress a wildlife and fisheries officer.