Thanks for the link Jon. It does help me understand the cultural portions of the difference. It is interesting to note that the general thrust of the article seems to show the benefits of indoor life. It is a good step in showing people on your side of the pond.

As for the "negative" aspects, it is worth noting that all of them can be overcome with the help of a thoughtful owner. The boredom can be reversed and instinct to hunt can be satisfied without having to resort to letting the cat roam free.