Why is it necessary for cats to hunt? As domesticated animals they are supposed to be fed by their owners. They may want to hunt, but they do not have to hunt. My six year old niece WANTS to eat M&Ms for breakfast but she doesn't NEED to. And a well-fed cat will generally kill only for sport or "gift-giving." And yes, cats lack the judgement in regards to this killing. But i guess that I am being ridiculous in assuming that responsible owners who have some regard for other forms of animal life would be the ones exercising some rational judgement and feline control.