I agree 100% with letting cats outside - but with human supervision. My two cats go out most days but only when I'm out with them watching. Neither has ever had an opportunity to catch a bird with me present. Also, they are much safer from predators. Urban coyotes are a real and growing menace to city pets in Vancouver. Since the City puzzlingly has a hands-off policy re. coyotes (this contrasts starkly with a zero tolerance  policy re. cougars and bears that wander into town) - cat and dog owners must protect pets from coyotes in their own ways. Outdoor supervision helps cats live to meow the tale  of being outside!