Stating that
Most people's "outdoor" cats seemed to live short horrible lives
is complete nonsense.

I understand that in some parts of the world it is simply not safe to allow cats outside due to local laws and attitudes of people but in many parts of the world cats can be allowed outside to enjoy a natural, healthy lifestyle.

All of the cats I have owned have enjoyed long healthy happy lives, all of them living into their teens...

Sorry to sound so belligerant but I do think we often forget that the reasons cats are locked inside is due to the fact they would not be safe outside - and that is due to us, mankind. They would certainly be happier outside because it is in their nature to "explore", climb trees, chase mice and birds, meet and socialise with other cats, and play hide and seek in the bushes. We could argue that it is "safer" for them inside but at some point we must realise that it would be like keeping your child locked inside all their life for fear of something happening to them...there is a trade off at some point and it is important to realise that this varies from place to place. If the dangers to your pet are real then it makes sense to keep them inside; if not then an outside life is ideal.