There are some cats that live quite happily inside their whole lives. The right home has people who play with the kitties, lots of things for them to do, plenty of mental and physical stimulation.

I have known cats that love to look out the window, but shun the open door - there's scary things out there!

How could letting a cat outside in an urban environment possibly benefit it at all? It is not "nature's way" to have cars and trucks that could run it over, bicycles and pedestrian traffic, and few safe places to be.

Not everyone lives in the country. Not everyone lives in areas without a significant pedator population. What is "fair" about turning an innocent kitten outdoors so it can be eaten by the owl that lives in the big pine next door?

Bear in mind that I do not currently own a cat, so you need not tell me I am depriving anyone of anything personally.