Unless you eat deer from behind a high fence, you don't have to worry about whether your venison is pure. They are not releasing these deer into the wild to breed with wild deer. They invest way too much money in them.
If high fences bother you, don't go pay money to shoot one of their animals.But, I can't blame a guy for making a living by letting someone shoot his livestock.
It aint for me. Unless the acreage is huge, this is not hunting at all. No high fence animal should be considered for any record book, unless they want to start a new one.