On the other hand, I figure that yes, a cat (which I'll never have - allergies) is safe indoors, but if they're happier outdoors... well, maybe nature will happen, but should I really imprison the cat to save it? Not as far as I'm concerned. The cat can go enjoy itself.

The point being, it's not that the cat is a problem. It's that some of us think nature should remain natural, not be pressed into service keeping us company.