The "anti's" don't like any form of hunting, regardless of whether it's free-range, a 100,000 acre high fence, or a 500 acre high fence. The PETA types don't want anyone hunting, and this is simply a divide and conquer issue for them. They like seeing the "free rangers" at the throats of the "high fencers."
My first "hunt" was on a high fenced place that was participating in a TPWD study prior to implementation of antler restrictions in the area. Hunted from a box blind near a food plot. Really wasn't any different from the box blind hunts I've done on "low-fenced" ranches... You sit there and wait for the deer to wander by, and hope that one who meets the ranch standards for a "shooter" shows up. The deer acted exactly the same way as "wild" deer. Only real difference was in the age structure of the herd.