> Well, your cat will also likely be very cruel if it ever caches a mouse or a bird

I'm no expert but I vaguely recall hearing from non-trivial sources that this is a common but inaccurate misrepresentation as regards their "intent". They are not "toying" with their hunting target so much as obeying a powerful instinct to be careful to kill it with the minimum risk of infection from getting even a small scratch in return from a target that is "playing dead" as a defense/evade tactic.