It makes a huge difference as to what size place is being fenced in and what the particular set up is like. Thousands of acres enclosed by just one outside perimeter fence; deer that haven't been shipped in from deer farms; and aren't totally dependent on humans for all their food; I'd agree the presence of a high fence around the place probably makes little difference.
That said, most of these places are not that benign. The deer are semi-domesticated, totally dependent on humans for survival, raised like cattle, and enclosed in a small enough area that John J. Gottrocks the III will be pretty much assured a shot after his check clears.
I don't advocate it being made illegal and if it floats your boat knock yourself out. I just take issue with it being called hunting. We used to occasional slaughter a hog on my grandfathers farm but we didn't call it a hunting trip.
Not my cup of tea but if I ever get the urge to do something like this I guess I'll just go shoot one of dads cows. About the same challenge most of these places present.
